2400 A packing company makes boxes 18 inches long, 12 inches wide and 10 inches high. What is the surface area of the boxes?
1032 inches 2
1632 inches 2
432 inches 2
600 inches 2

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.