A tank shaped like a cone pointing downward has height 9 9 feet and base radius 3 3 feet, and is full of water. The weight density of water is 62.4 lb ft 3 lbft3 . Find the work required to pump all of the water out over the top of the tank.

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.