Question

ABC is a right isosceles triangle right angled at A. Find the value of $\angle B$ and $\angle C$.

Answer 1

$\angle A={90}^o$

$\angle B=\angle C$ (Given the triangle is isosceles)

In$△ABC$

$\angle A+\angle B+\angle C={180}^o$

$90+\angle B+\angle C={180}^o$

$\angle B+\angle C={90}^o$

$\angle B+\angle B={90}^o$

$2\angle B={90}^o$

Hence, $\angle B=\angle C={45}^o$.