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