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Geometry: Proofs and Postulates Worksheet - Math Plane

angles) (def. of -c. Since angles are same and must parallelogram) add up to 180, each is 90 (coresponding angles) Therefore, AB is altitude. 3) Why are the triangles congruent? Vertical angles are congruent therefore, triangles are congruent (angle-side-angle) NOTE: Since C = D and D = A, then A— 6) Why are the triangles congruent?