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i think that you should ask google for the answer to that problem because if we don't know it google does

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

sounds & other waves originate from any vibrating object