Press space to see if a triangle is right. Press right arrow to find a missing leg. Press left arrow to find a missing hypotenuse. Remember: The largest number is the hypotenuse. This is a proof of concept Pythagorean Theorem calculator in Scratch. You can put in the lesser two numbers first and the greatest number lastly and it will tell you if the triangle is right or not. It will say "Yes" if it is, and "No" if it's not.