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Can someone please help explain how to do this?

What is the measure of B? C is 34 degrees.

Can someone please help explain how to do this What is the measure of B C is 34 degrees class=
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Answer:

m<B= 56

Step-by-step explanation:

A triangle has 180 degrees. This is right triangle meaning there is one angle that is 90 degrees. That's angle A since it's indicated by the little box.  So 90+34= 124. You then subtract that from 180 to get 56.

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