Which of the following states the Pythagorean theorem?

a. in a right triangle, the hypotenuse equals the sum of the squares of the legs.

b. in a right triangle, the square of the hypotenuse equals the sum of the legs.

c. in a right triangle, the square of the hypotenuse equals the sum of the squares of the legs.

d. in a right triangle, the hypotenuse equals the sum of the legs.