Question

Os ângulos de um triângulo medem 3x, 4x e 5x. O menor desses angulos mede

(A) 15°

(B) 18°

(C) 30°

(D) 45°​​

Answer 1

$\large\boxed{\begin{array}{l}\rm 3x+4x+5x=180^\circ\\\rm 12x=180^\circ\\\rm x=\dfrac{180^\circ}{12}\\\\\rm x=15^\circ\\\rm o~menor~\hat angulo~\acute e~3\cdot15^\circ=45^\circ\\\huge\boxed{\boxed{\boxed{\boxed{\rm\dagger\red{\maltese}~\blue{alternativa~D}}}}}\end{array}}$