Question

calcule o valor de x no triângulo a seguir ​

Answer 1

$\large \boxed{ \begin{array}{l} \rm \: a {}^{2} = b {}^{2} + c {}^{2} \\ \rm \: 13 {}^{2} = x {}^{2} + 12 {}^{2} \\ \rm \: 169 = x {}^{2} + 144 \\ \rm \: 169 - 144 = x {}^{2} \\ \rm \: x {}^{2} = \: 25 \\ \rm \: x = \sqrt{25} \\ \boxed{ \rm{x = 5}}\end{array}}$