How do you find the perimeter of a right triangle when two sides are missing?

To find the perimeter of a right triangle when two sides are missing, you'll first need to use the Pythagorean theorem, which states that (a^2 + b^2 = c^2), where (c) is the hypotenuse and (a) and (b) are the other two sides. If you have the length of one side and the hypotenuse, you can rearrange the formula to find the missing side. Once you have the lengths of all three sides, simply add them together to calculate the perimeter: (P = a + b + c).