B. 60°
∠A = 80°
∠B = ∠A/2 = 80°/2 = 40°
∠C = ?
Sum of all interior angles in a triangle = 180°
180° - 80° - 40° = 60°
∴ the measure of ∠C is 60°.
Is there more to this question?? if so i can assist you.
I think the answer is C.40
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