Abig penguin will eat three times as much as a small penguin. the big penguin will eat 21 grams of fish. let b = number of grams the big penguin eats. let s= number of grams the small penguin eats.

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.