Question

Determine o valor de x no triângulo a seguir​

Answer 1

a² = b² + c²

13² = 12² + x²

169 = 144 + x²

169 - 144 = x²

25 = x²

x = √25

x = 5

Letra C

Answer 2

Teorema de Pitágoras

$\huge\boxed{\begin{array}{lr}a {}^{2} = b {}^{2} + c {}^{2} \\ 13 {}^{2} = 12 {}^{2} + x {}^{2} \\ 169 = 144 + x {}^{2} \\ 169 - 144 = x {}^{2} \\ \sqrt{25} = \sqrt{x {}^{2} } \\ \huge\boxed{ \red{x = 5}} \\ \\ \boxed{ \blue{Opção \: (C) \: 5}}\end{array}}$