Question

The legs of a triangle measure 13 cm and 17 cm which of the following is the measure for the longest side of the triangle

Answer 1

c≈21.40093455,−21.40093455 that should be the right answer 

Answer 2

You would use the Pythagorean Theorem to solve this which is (leg squared)x(leg squared)=(hypotenuse or the longest side)
Your answer would be 21.4
Hope This Helps.