A contractor needs to pour a concrete floor in the shape of a rectangle. The figure shows the design for the concrete floor.

Question

The contractor uses the converse of the Pythagorean theorem to prove that the floor is rectangular. How can he do this?

A
He can show that 30 + 40 equals the square of the length of each diagonal.

B
He can show that 40 – 30 equals the square of the length of each diagonal.

C
He can show that 402 – 302 equals the square of the length of each diagonal.

D
He can show that 302 + 402 equals the square of the length of each diagonal.

Answer 1

D