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From Simple English Wikipedia, the free encyclopedia
Regular tetracontagon
A regular tetracontagon
TypeRegular polygon
Edges and vertices40
Schläfli symbol{40}, t{20}, tt{10}, ttt{5}
Coxeter diagram
Symmetry groupDihedral (D40), order 2×40
Internal angle (degrees)171°
Dual polygonSelf
PropertiesConvex, cyclic, equilateral, isogonal, isotoxal

A tetracontagon or 40-gon is a shape with 40 sides and 40 corners.

Regular tetracontagon[change | change source]

All sides of a regular tetracontagon are the same length. Each corner is 171°. All corners added together equal 6840°.

Area[change | change source]

The amount of space a regular tetracontagon takes up is

a is the length of one of its sides.