The corners of a 15-in by 15-in piece of cardboard are created, folded inward, and glued to make a giftbox. Write a polynomial that gives the volume of the resulting box..

incomplete question. how do you expect anyone to you when you do not post the question in its entirety?

answer:

what is your question that you ask

step-by-step explanation:

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.