Since this is a right triangle, we can use the Pythagorean theorem to solve. We know the hypotenuse is 4 and one leg is 3. We want to solve for the other leg.
a^2 +b^2 = c^2 where a and b are the legs and c is the hypotenuse.
You can start with any statement in the form a = a. Then add the same variable term to both sides, and add the same constant term to both sides. Combine like terms on each side.
