Suppose the population of a certain city is 3438 thousand. It is expected to decrease to 2638 thousand in 50 years. Find the percent decrease. The percent decrease is approximately 1%.
(Round to the nearest tenth.)

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.