in triangle ABC , angle A = 100 degree and AB = AC . find angle B​

2 thoughts on “in triangle ABC , angle A = 100 degree and AB = AC . find angle B​”

1. Answer:

   answer is 40

   Step-by-step explanation:

   let angle b= x

   ACQ:-

   a+b+c = 180(angle sum property)

   100 + x+x = 180(angle a = angle b (angles substituded by equal lines))

   2x = 80

   x =40

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2. Answer:

   angle B is 40°

   Step-by-step explanation:

   STEP BY STEP EXPLANATION:

   Angle a=100°—-(1.)

   AB=AC

   So, angle B=angleC —–(2.) (because angles opposite to equal sides are equal.)

   Thus, by (1) and (2) we can conclude that

   angle A+angleB+angleC=180°(Angle Sum Property)

   so, 100+angleB+angleB=180

   100+2(angle B)=180

   2(angleB)=180-100

   2(angle B)=80

   angle B=80/2

   angle B=40°

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