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In a parallelogram ABCD, ∠A = 70°. What is the measure of ∠B?
A70°
B110°
C20°
D90°
Answer & Solution
Correct answer: B. 110°
Adjacent angles of a parallelogram are supplementary: ∠A + ∠B = 180°. So ∠B = 180° − 70° = 110°. (The opposite angle ∠C is also 70°, and ∠D is 110°.)
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