Triangle qrs is a right triangle with the right angle at vertex r. the sum of m∠q and m∠s must be equal to 45°. greater than 45° and less than 90°. equal to 90°. greater than 90° and less than 180°.

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.

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