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Hatshy [7]
3 years ago
11

The measure of A is 90°. Angles A and B are supplementary. What is mB?

Mathematics
2 answers:
KIM [24]3 years ago
8 0
B.90 if angles are supplementary that means they add up to 180 degrees and 90 plus 90 is 180
Umnica [9.8K]3 years ago
3 0

Answer:

B. 90

Step-by-step explanation:

Since the two angles are supplementary, this means they both are on a flat line (180 degrees)

Since both A and B add up to 180, we take that number and subtract A (90) to get our answer: 90 degrees

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