Sum of Interior Angles of a Polygon Proof

| View Cart ⇗ | Info

Illustration used to prove “The sum of all the angles of any polygon is twice as many right angles as the polygon has sides, less four right angles.”


C.A. Hart, Daniel D. Feldman Plane and Solid Geometry (New York, NY: American Book Company, 1911)


TIFF (full resolution)

2400×1834, 297.0 KiB

Large GIF

1024×782, 35.4 KiB

Medium GIF

640×489, 18.3 KiB

Small GIF

320×244, 7.7 KiB