# How do you find the length side of c of a right triangle if side a = 15 and side b = 20?

${c}^{2} = {b}^{2} + {a}^{2} w i t h a = 15 \mathmr{and} b = 20$
${c}^{2} = 225 + 400 = 625 \to c = 25.$