Question

In triangle ABC, if angle a = 100 and AB = AC. Then find the measure of angle B.​

Answer 1

Answer:

Let the angle B andC be x

Sum of angles in a triangle= 180

2x=180-100=80

x=80÷2=40

Angle B= 40

Answer 2

Answer:

in triangle ABC

angle A=100 degree

AB=AC

then

angleB =angleC (opposite angles of equal sides are equal)

angleA+angleB+angleC=180 degree angle sum property of triangle

100 degree +angleB+angleC=180degree

100 + angle B+angleB=180

(angle B = angleC)

100+2angleB=180

2angleB=180-100

2angleB=80

angleB=80/2

angleB=40

therefore angle B=angleC =40degree

that is angleB=40degree and angleC=40degree

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