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Question

If ABC is a triangle such that AB = BC and B=60, then find the measure of A.

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Solution

Given,
AB = BC
B=60
Now,
A=C .. (i)
[Angles opposite to equal sides are always equal]

In Δ ABC,
A+B+C=180
[Angle Sum Property]
2A+60=180 [From (i)]
2A=120
A=60

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