in a triangle ABC angle A-angle B =42, angle B -angle C=21,find angle A,B,C

angle A- angle B =42
angle A= 42+angle B
angle B- angle C=21
angle C= angle B-21
angle A+angle B+angle C=180
42+angle B+angle B+angle B-21=180
3 angle B+21=180
3 angle B=159
angle B=159/3=53
 
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