Monica sells lemonade over the summer and uses conical paper cups to serve the lemonade. Each cup is 8 centimeters in diameter and 11 centimeters tall. She starts with a 10-gallon container (one gallon is equivalent to 3785 cm^3).

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.