How do you find perimeter with Pythagoras theorem?

To find the perimeter of a right triangle using the Pythagorean theorem, first determine the lengths of the two legs (a and b) using the theorem, which states ( c^2 = a^2 + b^2 ), where c is the hypotenuse. Once you have the lengths of all three sides, simply add them together: perimeter ( P = a + b + c ). This formula can also be applied to other polygons by determining the lengths of each side and summing them.