**A**

Answer: D. In a right triangle, the square of the hypotenuse equals the sum of the square of the legs.

The Pythagorean Theorem is a mathematical law that states that the sum of the square of the lengths of the two short sides of the right triangle is equal to the square of the length of the hypotenuse. This is algebraically written as a2+b2=c2. The sides of this triangle have been named as Perpendicular, Base, and Hypotenuse. Here, the hypotenuse is the longest side, as it is opposite to the angle 900

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