Pythagorean: a=80, b=80 c = 113.137085 Hypotenuse Copy Formula Usedc = √(80² + 80²) = √(6400 + 6400) = √12800 = 113.137085 Frequently Asked Questions If a=80 and b=80, what is c?c = √(6400+6400) = 113.137085.