CPM Homework Help : CC1 Problem 5-71

Bianca is trying to find the area of this rectangle. She already measured one side as $10$ cm. Which other length(s) could she measure to use in her area calculation? Explain your reasoning.

Hint:

How do you find area of a rectangle?

More help 1:

If $10$ cm is the base of the rectangle, which lengths could be the height?
You might want to rotate your paper so that the placement of the rectangle is more familiar.

More help 2:

The base and height must be perpendicular.

A rectangle with bottom side labeled,10 cm, and top side, labeled, d. The right side is labeled, b. Line segment c goes from the 10 cm side, to the, d, side, and is perpendicular to the, d, side. Line segment, a, goes from the top left vertex, to the 10 cm side.