Question

Find the length of the third side of a right triangle with a hypotenuse of 17 and a leg of 10.

Answer 1

You need to use the Pythagorean theorem.
${a}^{2} + {b}^{2} = {c}^{2}$
The hypotenuse is "c" and each leg is either "a" or "b".
${10}^{2} + { x}^{2} = {17}^{2}$
$100 + {x}^{2} = 289 \\ {x}^{2} = 189 \\ x = 13.7477270849$