Pythagorean: a=40, b=80 c = 89.442719 Hypotenuse Copy Formula Usedc = √(40² + 80²) = √(1600 + 6400) = √8000 = 89.442719 Frequently Asked Questions If a=40 and b=80, what is c?c = √(1600+6400) = 89.442719.