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Need help 8th grade math

Need help 8th grade math-example-1

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1 vote
The answer is 60 measures
User Roman Nurik
by
8.4k points
3 votes

Answer:

60°

Explanation:

outside angle = two opposite inside angles

10x - 45° = 4x + 3x

3x = 45°

x = 15°

m∠B = 4x

m∠B = 4(15°)

m∠B = 60°

User MiaN KhaLiD
by
7.9k points

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