Illustration used to prove the theorem “Two parallelograms are equal if two sides and the included angle of one are equal respectively to two sides and the included angle of the other.”
C.A. Hart, Daniel D. Feldman Plane and Solid Geometry (New York, NY: American Book Company, 1911)
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1024×250, 13.6 KiB
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320×78, 3.2 KiB