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OpenStudy (anonymous):
To determine the distance across a straight river, a surveyor chooses two points P and Q on the bank, where the distance between P and Q is 200 m. At each of these points, a point R on the opposite bank is sighted. The angle having sides PQ and PR is measured to be 63.1º and the angle having sides PQ and QR is measure to be 80.4º. What is the distance across the river?
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OpenStudy (phi):
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