in a triangle ABC, BC=AB and angle B=80 degrees, Then find the measure of angle A
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since the traingle is issoceless. ie Bc=AB. therefore angle A =angle C so let angle A = x. therefore angle C=x. we know that angle A + angle B +angle C= 180. so x+x+80=180. 2x=180-80, 2x= 100 x=50 so angle A=50
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