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 triangleGalleries
Geometric Theorems and ProofsSource
C. A. Hart & Daniel D. Feldman Plane And Solid Geometry (New York: American Book Company, 1911) 52
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