[tex] {a}^{2} + {b}^{2} = {c}^{2} [/tex] input your values [tex] {20}^{2} + {21}^{2} = {c}^{2} [/tex] solve [tex] {20}^{2} + {21}^{2} = 41 {}^{2} [/tex] then square root 'c' [tex] \sqrt{41} = 6.4 \: or \: \sqrt{41} [/tex] these options are for if your teacher wants it in radical form as mine had
