Exterior Angle Proof

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Illustration used to prove “An exterior angle of a triangle is equal to the sum of the two remote interior angles.”


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


TIFF (full resolution)

2400×865, 111.5 KiB

Large GIF

1024×369, 12.7 KiB

Medium GIF

640×230, 7.8 KiB

Small GIF

320×115, 3.5 KiB