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3 years ago

13

What is the measure

1 answer:

nekit [7.7K]3 years ago

5 0

Answer:

b = 12

Step-by-step explanation:

Complementary angles add to 90 degrees

a+b = 90

78+b = 90

Subtract 78 from each side

78-78+b = 90-78

b = 12

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