The graph of which function has an axis of symmetry at x = 3?
8+
4
-24
Of(x) = x2 + 3x + 1
+
-B-4-2
-103
2
4
6
8
10
x
+

+

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.