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Diagonal

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has nine diagonals: the six shorter ones are equal to each other in length; the three longer ones are equal to each other in length and intersect each other at the center of the hexagon. The ratio of a long diagonal to a side is 2, and the ratio of a short diagonal to a side is
1385:) may have two different types of diagonals: face diagonals on the various faces, connecting non-adjacent vertices on the same face; and space diagonals, entirely in the interior of the polyhedron (except for the endpoints on the vertices). 967:
with an odd number of sides. The formula follows from the fact that each intersection is uniquely determined by the four endpoints of the two intersecting diagonals: the number of intersections is thus the number of combinations of the
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has 14 diagonals. The seven shorter ones equal each other, and the seven longer ones equal each other. The reciprocal of the side equals the sum of the reciprocals of a short and a long diagonal.
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If the number of sides is even, the longest diagonal will be equivalent to the diameter of the polygon's circumcircle because the long diagonals all intersect each other at the polygon's center.
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by the small motion (θ, θ) to (θ, θ + ε). In general, the intersection number of the graph of a function with the diagonal may be computed using homology via the
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which describes the total number of face and space diagonals in convex polytopes. Here, v represents the number of vertices and e represents the number of edges.
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If no three diagonals of a convex polygon are concurrent at a point in the interior, the number of interior intersections of diagonals is given by
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Although the number of distinct diagonals in a polygon increases as its number of sides increases, the length of any diagonal can be calculated.
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1, 1, 0, 0, 0, and therefore Euler characteristic 0. A geometric way of expressing this is to look at the diagonal on the two-
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has two diagonals of equal length, which intersect at the center of the square. The ratio of a diagonal to a side is
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Poonen, Bjorn; Rubinstein, Michael. "The number of intersection points made by the diagonals of a regular polygon".
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at a single point in the interior, the number of regions that the diagonals divide the interior into is given by
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diagonals, as each vertex has diagonals to all other vertices except itself and the two adjacent vertices, or
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In geometry a line segment joining two nonconsecutive vertices of a polygon or polyhedron
884:{\displaystyle {\binom {n}{4}}+{\binom {n-1}{2}}={\frac {(n-1)(n-2)(n^{2}-3n+12)}{24}}.} 1952: 1103:. Additionally, the formula for the shortest diagonal simplifies in the case of x = 1: 981: 202: 1851:; the self-intersection of the diagonal is the special case of the identity function. 328:
diagonals in length, which follows the pattern 1,1,2,2,3,3... starting from a square.
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has five diagonals all of the same length. The ratio of a diagonal to a side is the
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Freeman, J. W. (1976). "The Number of Regions Determined by a Convex Polygon".
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with itself, consisting of all pairs (x,x), is called the diagonal, and is the
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Its total number of diagonals is 416. In general, an n-cube has a total of
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This formula shows that as the number of sides approaches infinity, the
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shortest diagonal. As an example, a 5-cube would have the diagonals:
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has two diagonals, joining opposite pairs of vertices. For any
1826: 1738: 1222: 170: 162: 158: 1787:. This plays an important part in geometry; for example, the 133:. Informally, any sloping line is called diagonal. The word 1837: 1809:
In geometric studies, the idea of intersecting the diagonal
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is common, not directly, but by perturbing it within an
1303:{\displaystyle {\frac {1+{\sqrt {5}}}{2}}\approx 1.618.} 193:
joining any two non-consecutive vertices. Therefore, a
2049:"Counting Diagonals of a Polyhedron – the Math Doctors" 1802:
to itself may be obtained by intersecting the graph of
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diagonals. This follows from the more general form of
929: 232: 1685: 1624: 1588: 1550: 1520: 1436: 1412: 1323: 1271: 1231: 1112: 1014: 928: 749: 290: 230: 83: 55: 201:, all the diagonals are inside the polygon, but for 1721: 1671: 1598: 1560: 1530: 1485: 1422: 1333: 1302: 1247: 1204: 1084: 955: 883: 317: 262: 93: 65: 1477: 1456: 990:Heptagon § Diagonals and heptagonal triangle 799: 778: 766: 753: 2083: 318:{\displaystyle \lfloor {\frac {n-2}{2}}\rfloor } 165:to refer to a line connecting two vertices of a 727: 45:with side length 1. AC' (shown in blue) is a 946: 933: 917: 205:, some diagonals are outside of the polygon. 312: 291: 2033:: CS1 maint: numeric names: authors list ( 2010: 1817:. This is related at a deep level with the 1915: 956:{\displaystyle \textstyle {\binom {n}{4}}} 129:, when those vertices are not on the same 1981:On-Line Encyclopedia of Integer Sequences 1248:{\displaystyle {\sqrt {2}}\approx 1.414.} 986:Hexagon § Convex equilateral hexagon 1906:Euclid, Elements book 11, proposition 38 1897:Euclid, Elements book 11, proposition 28 1486:{\displaystyle 2^{n-1}{\binom {n}{x+1}}} 1099:shortest diagonal approaches the length 36: 1942: 1926:. Mathematical Association of America. 1406:. The longest diagonal of an n-cube is 14: 2084: 2014:Circle Division Solution (old version) 2004: 1867: 145:, "from corner to corner" (from διά- 2000:link to a version on Poonen's website 1722:{\displaystyle {\frac {v(v-1)}{2}}-e} 1388: 997:In a regular n-gon with side length 902:=3, 4, ... the number of regions is 263:{\displaystyle {\tfrac {n(n-3)}{2}}} 975: 963:. This holds, for example, for any 24: 1672:{\displaystyle 2^{n-1}(2^{n}-n-1)} 1460: 1402:'s diagonals can be calculated by 937: 782: 757: 173:, and later adopted into Latin as 25: 2103: 2059: 906:1, 4, 11, 25, 50, 91, 154, 246... 1843:xS and observe that it can move 1398:The lengths of an n-dimensional 149:, "through", "across" and γωνία 1005:shortest distinct diagonal is: 73:, while AC (shown in red) is a 2041: 1988: 1963: 1909: 1900: 1891: 1882: 1861: 1704: 1692: 1666: 1641: 1351: 1193: 1180: 1159: 1146: 1137: 1119: 1073: 1060: 1051: 1042: 1030: 1021: 982:Quadrilateral § Diagonals 869: 841: 838: 826: 823: 811: 250: 238: 13: 1: 1998:. 11 (1998), no. 1, 135–156; 1849:Lefschetz fixed-point theorem 157:"knee"); it was used by both 1919:"A Problem in Combinatorics" 736:, if no three diagonals are 7: 1888:Strabo, Geography 2.1.36–37 1875:Online Etymology Dictionary 1868:Harper, Douglas R. (2018). 1732: 1599:{\displaystyle {\sqrt {5}}} 1561:{\displaystyle {\sqrt {3}}} 1531:{\displaystyle {\sqrt {2}}} 1423:{\displaystyle {\sqrt {n}}} 1334:{\displaystyle {\sqrt {3}}} 728:Regions formed by diagonals 180: 94:{\displaystyle {\sqrt {2}}} 66:{\displaystyle {\sqrt {3}}} 10: 2108: 2068:with interactive animation 2011:3Blue1Brown (2015-05-23). 1971:Sloane, N. J. A. 1501: 1430:. Additionally, there are 1355: 979: 918:Intersections of diagonals 332: 29: 1393: 972:vertices four at a time. 32:Diagonal (disambiguation) 1854: 1975:"Sequence A006522" 1376:three-dimensional space 1218:Special cases include: 153:, "corner", related to 2066:Diagonals of a polygon 1723: 1673: 1600: 1562: 1532: 1487: 1424: 1404:mathematical induction 1335: 1304: 1249: 1206: 1086: 957: 885: 319: 280:In general, a regular 264: 102: 95: 67: 1996:SIAM J. Discrete Math 1724: 1674: 1601: 1563: 1533: 1488: 1425: 1336: 1305: 1250: 1207: 1087: 958: 886: 320: 265: 96: 68: 40: 2023:– via YouTube. 1945:Mathematics Magazine 1819:Euler characteristic 1771:or equivalently the 1683: 1622: 1586: 1548: 1518: 1510:Number of diagonals 1434: 1410: 1321: 1269: 1229: 1110: 1012: 1001:, the length of the 926: 747: 288: 228: 81: 53: 30:For other uses, see 2092:Elementary geometry 1930:, pp. 99–107. 1916:Honsberger (1973). 1825:. For example, the 1806:with the diagonal. 284:-sided polygon has 203:re-entrant polygons 177:("slanting line"). 41:The diagonals of a 1984:. OEIS Foundation. 1719: 1669: 1596: 1558: 1528: 1483: 1420: 1331: 1300: 1245: 1202: 1082: 953: 952: 914:sequence A006522. 881: 315: 260: 258: 189:, a diagonal is a 103: 91: 63: 1924:Mathematical Gems 1870:"diagonal (adj.)" 1821:and the zeros of 1815:equivalence class 1777:identity function 1743:Cartesian product 1711: 1616: 1615: 1612: 1611: 1594: 1556: 1526: 1475: 1418: 1389:Higher dimensions 1329: 1292: 1286: 1237: 1191: 1157: 1135: 1071: 1049: 944: 876: 797: 764: 725: 724: 721: 720: 643: 642: 565: 564: 487: 486: 409: 408: 310: 257: 137:derives from the 89: 61: 16:(Redirected from 2099: 2072:Polygon diagonal 2053: 2052: 2045: 2039: 2038: 2032: 2024: 2022: 2021: 2008: 2002: 1992: 1986: 1985: 1967: 1961: 1960: 1941: 1929: 1921: 1913: 1907: 1904: 1898: 1895: 1889: 1886: 1880: 1879: 1865: 1737:By analogy, the 1728: 1726: 1725: 1720: 1712: 1707: 1687: 1678: 1676: 1675: 1670: 1653: 1652: 1640: 1639: 1605: 1603: 1602: 1597: 1595: 1590: 1567: 1565: 1564: 1559: 1557: 1552: 1537: 1535: 1534: 1529: 1527: 1522: 1504: 1503: 1500: 1492: 1490: 1489: 1484: 1482: 1481: 1480: 1474: 1459: 1452: 1451: 1429: 1427: 1426: 1421: 1419: 1414: 1340: 1338: 1337: 1332: 1330: 1325: 1309: 1307: 1306: 1301: 1293: 1288: 1287: 1282: 1273: 1259:regular pentagon 1254: 1252: 1251: 1246: 1238: 1233: 1211: 1209: 1208: 1203: 1192: 1184: 1158: 1150: 1136: 1131: 1123: 1091: 1089: 1088: 1083: 1072: 1064: 1050: 1045: 1025: 976:Regular polygons 962: 960: 959: 954: 951: 950: 949: 936: 890: 888: 887: 882: 877: 872: 853: 852: 809: 804: 803: 802: 793: 781: 771: 770: 769: 756: 647: 646: 569: 568: 491: 490: 413: 412: 335: 334: 331: 324: 322: 321: 316: 311: 306: 295: 269: 267: 266: 261: 259: 253: 233: 212:-sided polygon ( 185:As applied to a 100: 98: 97: 92: 90: 85: 72: 70: 69: 64: 62: 57: 21: 2107: 2106: 2102: 2101: 2100: 2098: 2097: 2096: 2082: 2081: 2062: 2057: 2056: 2047: 2046: 2042: 2026: 2025: 2019: 2017: 2009: 2005: 1993: 1989: 1968: 1964: 1938: 1927: 1914: 1910: 1905: 1901: 1896: 1892: 1887: 1883: 1866: 1862: 1857: 1735: 1688: 1686: 1684: 1681: 1680: 1648: 1644: 1629: 1625: 1623: 1620: 1619: 1589: 1587: 1584: 1583: 1551: 1549: 1546: 1545: 1521: 1519: 1516: 1515: 1507:Diagonal length 1476: 1464: 1455: 1454: 1453: 1441: 1437: 1435: 1432: 1431: 1413: 1411: 1408: 1407: 1396: 1391: 1380:two-dimensional 1364: 1354: 1324: 1322: 1319: 1318: 1281: 1274: 1272: 1270: 1267: 1266: 1232: 1230: 1227: 1226: 1183: 1149: 1124: 1122: 1111: 1108: 1107: 1063: 1026: 1024: 1013: 1010: 1009: 992: 978: 965:regular polygon 945: 932: 931: 930: 927: 924: 923: 920: 848: 844: 810: 808: 798: 783: 777: 776: 775: 765: 752: 751: 750: 748: 745: 744: 730: 296: 294: 289: 286: 285: 234: 231: 229: 226: 225: 183: 84: 82: 79: 78: 77:and has length 56: 54: 51: 50: 35: 28: 23: 22: 15: 12: 11: 5: 2105: 2095: 2094: 2080: 2079: 2069: 2061: 2060:External links 2058: 2055: 2054: 2040: 2003: 1987: 1962: 1936: 1908: 1899: 1890: 1881: 1859: 1858: 1856: 1853: 1734: 1731: 1718: 1715: 1710: 1706: 1703: 1700: 1697: 1694: 1691: 1668: 1665: 1662: 1659: 1656: 1651: 1647: 1643: 1638: 1635: 1632: 1628: 1614: 1613: 1610: 1609: 1606: 1593: 1580: 1579: 1576: 1572: 1571: 1568: 1555: 1542: 1541: 1538: 1525: 1512: 1511: 1508: 1479: 1473: 1470: 1467: 1463: 1458: 1450: 1447: 1444: 1440: 1417: 1395: 1392: 1390: 1387: 1362:Space diagonal 1353: 1350: 1328: 1299: 1296: 1291: 1285: 1280: 1277: 1244: 1241: 1236: 1213: 1212: 1201: 1198: 1195: 1190: 1187: 1182: 1179: 1176: 1173: 1170: 1167: 1164: 1161: 1156: 1153: 1148: 1145: 1142: 1139: 1134: 1130: 1127: 1121: 1118: 1115: 1093: 1092: 1081: 1078: 1075: 1070: 1067: 1062: 1059: 1056: 1053: 1048: 1044: 1041: 1038: 1035: 1032: 1029: 1023: 1020: 1017: 977: 974: 948: 943: 940: 935: 919: 916: 908: 907: 892: 891: 880: 875: 871: 868: 865: 862: 859: 856: 851: 847: 843: 840: 837: 834: 831: 828: 825: 822: 819: 816: 813: 807: 801: 796: 792: 789: 786: 780: 774: 768: 763: 760: 755: 734:convex polygon 729: 726: 723: 722: 719: 718: 715: 711: 710: 707: 703: 702: 699: 695: 694: 691: 687: 686: 683: 679: 678: 675: 671: 670: 667: 663: 662: 659: 655: 654: 651: 644: 641: 640: 637: 633: 632: 629: 625: 624: 621: 617: 616: 613: 609: 608: 605: 601: 600: 597: 593: 592: 589: 585: 584: 581: 577: 576: 573: 566: 563: 562: 559: 555: 554: 551: 547: 546: 543: 539: 538: 535: 531: 530: 527: 523: 522: 519: 515: 514: 511: 507: 506: 503: 499: 498: 495: 488: 485: 484: 481: 477: 476: 473: 469: 468: 465: 461: 460: 457: 453: 452: 449: 445: 444: 441: 437: 436: 433: 429: 428: 425: 421: 420: 417: 410: 407: 406: 403: 399: 398: 395: 391: 390: 387: 383: 382: 379: 375: 374: 371: 367: 366: 363: 359: 358: 355: 351: 350: 347: 343: 342: 339: 314: 309: 305: 302: 299: 293: 256: 252: 249: 246: 243: 240: 237: 199:convex polygon 182: 179: 88: 60: 47:space diagonal 26: 9: 6: 4: 3: 2: 2104: 2093: 2090: 2089: 2087: 2077: 2073: 2070: 2067: 2064: 2063: 2050: 2044: 2036: 2030: 2029:cite AV media 2016: 2015: 2007: 2001: 1997: 1991: 1983: 1982: 1976: 1972: 1966: 1958: 1954: 1950: 1946: 1939: 1937:0-88385-301-9 1933: 1925: 1920: 1912: 1903: 1894: 1885: 1877: 1876: 1871: 1864: 1860: 1852: 1850: 1846: 1842: 1839: 1835: 1834:Betti numbers 1831: 1828: 1824: 1823:vector fields 1820: 1816: 1812: 1807: 1805: 1801: 1797: 1794: 1790: 1786: 1782: 1778: 1774: 1770: 1766: 1763: 1759: 1755: 1751: 1747: 1744: 1740: 1730: 1716: 1713: 1708: 1701: 1698: 1695: 1689: 1663: 1660: 1657: 1654: 1649: 1645: 1636: 1633: 1630: 1626: 1607: 1591: 1582: 1581: 1577: 1574: 1573: 1569: 1553: 1544: 1543: 1539: 1523: 1514: 1513: 1509: 1506: 1505: 1502: 1498: 1496: 1471: 1468: 1465: 1461: 1448: 1445: 1442: 1438: 1415: 1405: 1401: 1386: 1384: 1381: 1378:, bounded by 1377: 1373: 1369: 1363: 1359: 1358:Face diagonal 1349: 1347: 1342: 1326: 1315: 1310: 1297: 1294: 1289: 1283: 1278: 1275: 1264: 1260: 1255: 1242: 1239: 1234: 1224: 1219: 1216: 1199: 1196: 1188: 1185: 1177: 1174: 1171: 1168: 1165: 1162: 1154: 1151: 1143: 1140: 1132: 1128: 1125: 1116: 1113: 1106: 1105: 1104: 1102: 1098: 1079: 1076: 1068: 1065: 1057: 1054: 1046: 1039: 1036: 1033: 1027: 1018: 1015: 1008: 1007: 1006: 1004: 1000: 995: 991: 987: 983: 973: 971: 966: 941: 938: 915: 913: 905: 904: 903: 901: 897: 878: 873: 866: 863: 860: 857: 854: 849: 845: 835: 832: 829: 820: 817: 814: 805: 794: 790: 787: 784: 772: 761: 758: 743: 742: 741: 739: 735: 716: 713: 712: 708: 705: 704: 700: 697: 696: 692: 689: 688: 684: 681: 680: 676: 673: 672: 668: 665: 664: 660: 657: 656: 652: 649: 648: 645: 638: 635: 634: 630: 627: 626: 622: 619: 618: 614: 611: 610: 606: 603: 602: 598: 595: 594: 590: 587: 586: 582: 579: 578: 574: 571: 570: 567: 560: 557: 556: 552: 549: 548: 544: 541: 540: 536: 533: 532: 528: 525: 524: 520: 517: 516: 512: 509: 508: 504: 501: 500: 496: 493: 492: 489: 482: 479: 478: 474: 471: 470: 466: 463: 462: 458: 455: 454: 450: 447: 446: 442: 439: 438: 434: 431: 430: 426: 423: 422: 418: 415: 414: 411: 404: 401: 400: 396: 393: 392: 388: 385: 384: 380: 377: 376: 372: 369: 368: 364: 361: 360: 356: 353: 352: 348: 345: 344: 340: 337: 336: 333: 329: 327: 307: 303: 300: 297: 283: 278: 276: 272: 254: 247: 244: 241: 235: 223: 219: 215: 211: 206: 204: 200: 196: 195:quadrilateral 192: 188: 178: 176: 172: 168: 164: 160: 156: 152: 148: 144: 140: 139:ancient Greek 136: 132: 128: 124: 120: 116: 112: 108: 86: 76: 75:face diagonal 58: 48: 44: 39: 33: 19: 2043: 2018:. Retrieved 2013: 2006: 1995: 1990: 1978: 1965: 1951:(1): 23–25. 1948: 1944: 1923: 1911: 1902: 1893: 1884: 1873: 1863: 1844: 1840: 1829: 1810: 1808: 1803: 1799: 1795: 1789:fixed points 1784: 1780: 1768: 1753: 1749: 1745: 1736: 1617: 1494: 1397: 1372:solid object 1365: 1343: 1311: 1263:golden ratio 1256: 1220: 1217: 1214: 1100: 1096: 1094: 1002: 998: 996: 993: 969: 921: 909: 899: 895: 893: 731: 325: 281: 279: 274: 270: 213: 209: 207: 191:line segment 184: 174: 154: 150: 146: 142: 134: 117:joining two 115:line segment 110: 104: 49:with length 18:Off-diagonal 1811:with itself 1752:of any set 1352:Polyhedrons 898:-gons with 2020:2024-09-01 1845:off itself 1368:polyhedron 1356:See also: 1344:A regular 1312:A regular 980:See also: 738:concurrent 653:Diagonals 575:Diagonals 497:Diagonals 419:Diagonals 341:Diagonals 141:διαγώνιος 127:polyhedron 2076:MathWorld 1714:− 1699:− 1661:− 1655:− 1634:− 1446:− 1400:hypercube 1295:≈ 1240:≈ 1197:∗ 1186:π 1178:⁡ 1163:∗ 1152:π 1144:⁡ 1129:π 1117:⁡ 1077:∗ 1066:π 1058:⁡ 1028:π 1019:⁡ 855:− 833:− 818:− 788:− 313:⌋ 301:− 292:⌊ 245:− 143:diagonios 2086:Category 1765:relation 1762:equality 1733:Geometry 1346:heptagon 910:This is 326:distinct 181:Polygons 175:diagonus 135:diagonal 119:vertices 111:diagonal 107:geometry 1973:(ed.). 1957:2689875 1793:mapping 1775:of the 1760:of the 1741:of the 1493:of the 1314:hexagon 222:concave 187:polygon 167:rhombus 123:polygon 1955:  1934:  1827:circle 1748:× 1739:subset 1394:N-Cube 1298:1.618. 1243:1.414. 1223:square 1101:(x+1)a 988:, and 224:, has 218:convex 216:≥ 3), 171:cuboid 163:Euclid 159:Strabo 2074:from 1953:JSTOR 1928:Ch. 9 1855:Notes 1838:torus 1798:from 1791:of a 1779:from 1773:graph 1758:graph 1383:faces 732:In a 650:Sides 572:Sides 494:Sides 416:Sides 338:Sides 271:total 151:gonia 121:of a 113:is a 2035:link 1979:The 1932:ISBN 1832:has 1570:160 1540:160 1360:and 912:OEIS 894:For 717:819 709:779 701:740 693:702 685:665 677:629 669:594 661:560 639:527 631:495 623:464 615:434 607:405 599:377 591:350 583:324 561:299 553:275 545:252 537:230 529:209 521:189 513:170 505:152 483:135 475:119 467:104 208:Any 161:and 155:gony 147:dia- 131:edge 109:, a 43:cube 1783:to 1767:on 1608:16 1578:80 1495:xth 1374:in 1370:(a 1175:cos 1141:csc 1114:sin 1097:xth 1055:csc 1016:sin 1003:xth 459:90 451:77 443:65 435:54 427:44 405:35 397:27 389:20 381:14 220:or 169:or 125:or 105:In 2088:: 2031:}} 2027:{{ 1977:. 1949:49 1947:. 1922:. 1872:. 1366:A 1341:. 1265:, 1257:A 1221:A 984:, 874:24 867:12 714:42 706:41 698:40 690:39 682:38 674:37 666:36 658:35 636:34 628:33 620:32 612:31 604:30 596:29 588:28 580:27 558:26 550:25 542:24 534:23 526:22 518:21 510:20 502:19 480:18 472:17 464:16 456:15 448:14 440:13 432:12 424:11 402:10 373:9 365:5 357:2 349:0 2078:. 2051:. 2037:) 1959:. 1940:. 1878:. 1841:S 1830:S 1804:F 1800:X 1796:F 1785:X 1781:X 1769:X 1754:X 1750:X 1746:X 1717:e 1709:2 1705:) 1702:1 1696:v 1693:( 1690:v 1667:) 1664:1 1658:n 1650:n 1646:2 1642:( 1637:1 1631:n 1627:2 1592:5 1575:2 1554:3 1524:2 1478:) 1472:1 1469:+ 1466:x 1462:n 1457:( 1449:1 1443:n 1439:2 1416:n 1327:3 1290:2 1284:5 1279:+ 1276:1 1235:2 1200:a 1194:) 1189:n 1181:( 1172:2 1169:= 1166:a 1160:) 1155:n 1147:( 1138:) 1133:n 1126:2 1120:( 1080:a 1074:) 1069:n 1061:( 1052:) 1047:n 1043:) 1040:1 1037:+ 1034:x 1031:( 1022:( 999:a 970:n 947:) 942:4 939:n 934:( 900:n 896:n 879:. 870:) 864:+ 861:n 858:3 850:2 846:n 842:( 839:) 836:2 830:n 827:( 824:) 821:1 815:n 812:( 806:= 800:) 795:2 791:1 785:n 779:( 773:+ 767:) 762:4 759:n 754:( 394:9 386:8 378:7 370:6 362:5 354:4 346:3 308:2 304:2 298:n 282:n 275:n 255:2 251:) 248:3 242:n 239:( 236:n 214:n 210:n 101:. 87:2 59:3 34:. 20:)

Index

Off-diagonal
Diagonal (disambiguation)

cube
space diagonal
face diagonal
geometry
line segment
vertices
polygon
polyhedron
edge
ancient Greek
Strabo
Euclid
rhombus
cuboid
polygon
line segment
quadrilateral
convex polygon
re-entrant polygons
convex
concave
convex polygon
concurrent
OEIS
regular polygon
Quadrilateral § Diagonals
Hexagon § Convex equilateral hexagon

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