![]() ^ Leon Bankoff and Jack Garfunkel, "The heptagonal triangle", Mathematics Magazine 46 (1), January 1973, 7–19. The dollar sign, , isn't a fancy S but is probably based on the shape.^ a b c Abdilkadir Altintas, "Some Collinearities in the Heptagonal Triangle", Forum Geometricorum 16, 2016, 249–256.Point group character tables and related data. Conway, Heidi Burgiel, Chaim Goodman-Strauss, (2008) The Symmetries of Things, ISBN 978-1-56881-220-5 (Chapter 20, Generalized Schaefli symbols, Types of symmetry of a polygon pp. 15, image on the left side, retrieved on 4 December 2015 Hughes, "The Polygons of Albrecht Dürer-1525, The Regular Heptagon", Fig. Annals of the New York Academy of Sciences. My vision of the temple of working, was two seven sided cone shapes, one on top of the other, with me. "Abu'l-Jūd's Answer to a Question of al-Bīrūnī Concerning the Regular Heptagon" (PDF). Archived from the original (PDF) on 19 December 2015. "Angle trisection, the heptagon, and the triskaidecagon p. ^ Gleason, Andrew Mattei (March 1988).Its Schläfli symbol is heptagram outline. The heptagon is sometimes referred to as the septagon, using "sept-" (an elision of septua-, a Latin-derived numerical prefix, rather than hepta-, a Greek-derived numerical prefix both are cognate) together with the Greek suffix "-agon" meaning angle.Ī regular heptagon, in which all sides and all angles are equal, has internal angles of 5π/7 radians (128 4⁄ 7 degrees). In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon. ![]() Convex, cyclic, equilateral, isogonal, isotoxal
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