In 1927, charles lindbergh had his first
solo flight across the atlantic ocean. he
flew 3,610 miles in 33.5 hours. if he flew
about the same number of miles each
hour, how many miles did he fly each
hour?

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.