3 years ago

What is the measure of ∠B?

Mathematics

1 answer:

Alenkinab [10]3 years ago

7 0

Answer:

m<B = 60

Step-by-step explanation:

Exterior angle thm:

3x + 4x = 10x - 45

7x = 10x - 45

7x - 10x = -45

-3x = -45

x = 15

<B:

4(15)

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