Question

In fig
LA = 40
then, AB=AC
then LB=​

Answer 1

After seeing the figure we can say that it is an isosceles triangle

In an isosceles triangle both sides are equal and their opposite angles are also equal

Therefore angle B= angle C

A+B+C=180(angle sum theorem)

40+ B+C = 180

B+ C = 140

B+B=140( both angles are equal as proved above)

2B=140

B=140/2

B=70

AS WE KNEW B=C

C = 70