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I am guessing you mean you are given 2 of the 3 interior angles of a triangle and are asked for the 3rd. Well, it is a theorem that the 3 angles of a triangle add up to 180 degrees. So add the 2 given angles and subtract the sum from 180. to get the measure of the 3rd angle.

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12y ago

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Q: How do you find a third angle?
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