9) 1713
2
1712
A) X= 17, y =
4
17
B) x= 1772, y =
C) <= 17, y="
D) x= 1772, y=
E) x = "=1772
1772
y=-
4

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.