In Activity 5, the perimeter of $ riangle ABC$ is $12$ cm with $\angle B = 60°$ and $\angle C = 45°$. The third angle $

Question

In Activity 5, the perimeter of $	riangle ABC$ is $12$ cm with $\angle B = 60°$ and $\angle C = 45°$. The third angle $\angle A$ equals —

Accepted Answer

$75°$

Answer

$60°$

Answer

$90°$

Answer

$45°$

In Activity 5, the perimeter of △ABC\triangle ABC△ABC is 121212 cm with ∠B=60°\angle B = 60°∠B=60° and ∠C=45°\angle C = 45°∠C=45°. The third angle ∠A\angle A∠A equals —