In the same way that you subtract and add numbers.
Sometimes, though, if the answer is greater than 360 dgrees, you can subtract 360. This is because the angle measure of a whole turn and a bit is the same as the angle measure of the bit.
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Subtract the interior angle by 360 degrees
you add them then subtract by 180 to find the unknown angle
Angle a plus angle b subtract from 180 equals angle c
what polygon has angle measures that add up to 360
Each exterior angle measures 72 degrees and they add up to 360 degrees Each interior angle measures 108 degrees and they add up to 540 degrees