In a angleABC AB=AC If angle B=30degree what is the measure of angleA?
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A+B+C= 180°
(angle sum of property of a ∆)
B=C= 30°
(∆ ABC is an isosceles ∆)
A + 30° +30° = 180°
A + 60° = 180°
A = 120°
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