Question

calcule o valor de x no triângulo ​

Answer 1

Fazendo uso da trinogometria temos que:  

$\longrightarrow\Large\boxed{\mbox{x vale 12cm}}$

Aplicando o teorema de Pitágoras ao triangulo temos

$x^2+5^2=13^2\\\\\\x^2+25=169\\\\\\x^2=169-25\\\\\\x^2=144\\\\\\x=\sqrt{144}\\\\\\x=12$

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