Question

In ABCD,angle A=100° and AB=AC find angle B and angle C​

Answer 1

Answer:

angles opposite to equal sides in a triangle are equal

as AB = AC

so angle C = angle B

again, angle A + angle B + angle C = 180 (angle sum property of triangle)

or 100 + angle B + angle B = 180

or 2 angle B = 80

or angle B = 40

so, angle B = angle C = 40