Precalculus
posted by Anonymous .
A surveyor stands on one edge of a ravine. She determines that the ravine w is 140 feet wide. She then determines that the angle of depression from the edge where she is standing to a point on the bottom of the ravine a is 57.5°, as shown in figure below (which is not to scale). How deep is the ravine? (Round your answer to one decimal place.)

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