Question

∆ ABC , AB= AC and angle A is 100° , Then angle B is *

Answer 1

Answer:

Angle B =40°

Step-by-step explanation:

According to the question in

∆ABC two sides are equal which means that it is an isosceles triangle. So in this type of triangle there are two equal angles (angle B and C) and it is given that angle A = 100°.

According to angle sum property

Angle A+B+C= 180°

(Let angle B and C be angle X)

So, A+2X=180°

100°+2X=180°

2X=180°-100°

X=80°÷2

X=40°

Hence, Angle B=Angle C= 40°

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