Question

Os ângulos de um triângulo são respectivamente, x ; x + 10 e x + 20, assinale a alternativa que indica o valor de x

Answer 1

$\mathsf{x+x+10^{\circ}+x+20^{\circ}=180^{\circ}}\\\mathsf{3x=180^{\circ}-30^{\circ}}\\\mathsf{3x=150^{\circ}}\\\mathsf{x=\dfrac{150^{\circ}}{3}}\\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{x=50^{\circ}}}}}}$