Shawn warms up for hours before playing tennis. Each set he plays lasts hours, so x sets will take hours. If he has a total of hours available to warm up and play, how many sets can he play? He can play blank sets.

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.