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PQR is an isosceles triangle with PQ = QR. If mQPR = 40°, what is mPQR?
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Angles that are opposite of the equal sides are also equal. So angle PRQ which is opposite of side PQ will be 40 degrees. You now know the measures of two out of three angles. Since the sum of all three angles = 180 degrees, you can now calculate the mPQR
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