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Ik a = 25 but can someone explain how they got that please

Ik a = 25 but can someone explain how they got that please-example-1

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Answer:

Explanation:

That little square in the corner of that angle means that it's a right angle and its measure is 90 degrees. That means that by the angle addition postulate, those angles added together have to equal 90.

90-65 = 25

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