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The Brainliest Answer!
2016-03-21T20:02:32+05:30
In triangle ABC, AB = BC. Therefore, angle B = angle C = x.
 Also given , angle A = 2x - 20.
 By angle sum property of a triangle,
 we have angle A + angle B + angle C = 180 degrees
 so , 2x - 20 + x + x = 180
 => 4x = 180 + 20 
 => 4x = 200           
 =>  x = 50 degrees
  Therefore, angle B = 50 degrees. (angle A = 2(50) - 20 = 80 degrees and angle C = 50 degrees)
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