# Exterior Angle of Triangle Theorem

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Illustration used to prove that “If one side of a triangle is prolonged, the exterior angle formed is greater than either of the remote interior angles.”

### Keywords

geometry, proof, triangles, theorem, exterior angles, prove, theorems, exterior angle of a triangle### Galleries

Geometric Theorems and Proofs### Source

C. A. Hart & Daniel D. Feldman *Plane And Solid Geometry* (New York: American Book Company, 1911) 52

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