Question

What is the measure of

Answer 1

C. 120°

Explanation:

Since this is an isosceles triangle [two congruent sides], m<B is also 30°. Now, we have to the m<A by using the Interior Angles Theorem [m<1 + m<2 + m<3 = 180°]. So we do this:

60 + m<A = 180; 120 = m<A

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Answer 2

I think (c) 120 is right answer.