Answer:
As a general rule, the angles of a triangle always add to 180 degrees. To calculate a missing angle, you add the other two angles, and then subtract that sum from 180.
For example, if you have two angles, 72 degrees and 28 degrees, you can add them to get 100. Then, by subtracting 100 from 180, you can deduce that the missing angle measures 80 degrees.
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