Fredrick threw a ball from the top of a building. The height of the ball, in feet, after it is thrown is modeled by the function h() = -1612 + 641 + 100, where i represents time, in seconds.

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.