Graph the point (-10,-5) on the coordinate plane. 1044
8
6
4
2
X
-10
-8
-6
-4
-2
0
2
4
6
8
10
-2
-4
-6
-8
-10

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.