a tower has been constructed on the bank of a long straight river. from a bench on the opposite bank and 50m downstream from the tower, the angle of elevation of the top of the tower is 30°. from a second bench on the same side as the tower and 100m upstream from the tower, the angle of elevation of the top of the tower is 20° find:
the height of the tower
the width of the river
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50 feet and 60 feet...........
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