The correct statement that explains the Pythagorean Theorem is:
"If a triangle is a right triangle, then the sum of the squares of the legs is equal to the square of the hypotenuse."
This can be mathematically expressed as \(a^2 + b^2 = c^2\), where \(c\) is the length of the hypotenuse and \(a\) and \(b\) are the lengths of the other two legs of the triangle.