In baseball, the flight of a pop-up may be described as d=-16t^2+80t+3.5 where d gives the ball's height above the ground in feet as a function of time t. How long does the catcher have to get into
position under the ball after the ball is hit

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.