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2 years ago

9

I WILL GIVE BRAINLIEST TO WHO ANSWERS RIGHT!!! The measure of A is 100°. Angles A and B are supplementary. What is mB? A.mB = 10

° B.mB = 80° C.mB = 90°
D.mB = 180°

1 answer:

vova2212 [387]2 years ago

4 0

Answer:

B. m∠B = 80°

Step-by-step explanation:

Supplementary angles are two angles that sum to 180°

⇒ m∠A + m∠B = 180°

⇒ 100° + m∠B = 180°

⇒ m∠B = 180° - 100°

⇒ m∠B = 80°

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