Melon, Kiwi, Lupert, & Corn know that a triangle with sides of 3 units, 4 units, and 5 units is a right triangle. Their teacher asks them to find another right triangle. Lupert triples the side lengths of the 3, 4, 5 triangle to get a triangle of 9, 12, 15. Melon adds three to the side lengths of the 3, 4, 5 triangle to get a triangle of 6, 7, 8. Kiwi doubles the side lengths of the 3, 4, 5 triangle to get a triangle of 6, 8, 10. Corn adds four to the side lengths of the 3, 4, 5 triangle to get a triangle of 7, 8, 9. Who correctly made a right triangle? Explain or show how you know.