Which statement explains the Pythagorean Theorem?

1. If a triangle is a right triangle, then the sum of the squares of the legs is equal to the square of the hypotenuse.
2. Yes, because it is a right triangle.
3. No, because 244 is not equal to 225.
4. The triangle is a right triangle with a missing leg length of 24.
5. The if part and the then part switch places.

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The correct statement that explains the Pythagorean Theorem is:

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