Which statement explains the Pythagorean Theorem?

1. If the interior angles of a triangle add up to 180° , then the sum of the legs of the triangle is equal to the square of the hypotenuse
2. If all angels in the a triangle are of equal measure, Then the length of all sides will be equal
3. If a triangle is a right triangle, then the sum of the squares of the longest leg and the hypotenuse is equal to the square of the third side
4. If a triangle is a right triangle, then the sum of the squares of the legs is equal to the square of the hypotenuse

1 answer

4. If a triangle is a right triangle, then the sum of the squares of the legs is equal to the square of the hypotenuse.