Question

In the given figure, find $x$.

Answer 1

REF.IMAGE

AB = AC

$\therefore isoscelestriangle$

$\therefore \angle B=\angle C=x$

$\therefore {100}^{\circ }+X+X={180}^{\circ }$

$2X={80}^{\circ }\Rightarrow X={40}^{\circ }$