神马作文网200分求一道数学题,懂英文的来拉,图片应该会一会儿会上去
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200分求一道数学题,懂英文的来拉,图片应该会一会儿会上去
Two points P and Q on level ground are on opposite sides of a building.To find the distance between the points,a surveyor chooses a point R that is a = 328 feet from P and c = 446 feet from Q and then determines that angle PRQ has measure α = 35°50' (see the figure).Approximate the distance between P and Q.(Round your answer to the nearest whole number.)
Two points P and Q on level ground are on opposite sides of a building.To find the distance between the points,a surveyor chooses a point R that is a = 328 feet from P and c = 446 feet from Q and then determines that angle PRQ has measure α = 35°50' (see the figure).Approximate the distance between P and Q.(Round your answer to the nearest whole number.)
PQ^2=c^2 +a^2 - 2·a·c·cosα=328^2+446^2-2*328*446*cos35°50'=68309.3381
so PQ=261.36 feet
so PQ=261.36 feet