Posted by **Sasuke** on Wednesday, August 1, 2012 at 11:42am.

From a mountain 1780 ft. high, the angle of depression of a point on the nearer shore of a river is 48 degrees 40 minutes and of a point directly across on the opposite side is 22 degrees 20 minutes. What is the width of the river between the two points?

- math - incomplete -
**Steve**, Wednesday, August 1, 2012 at 1:01pm
If you draw a diagram, you will see that you cannot compute the width of the river without knowing how far the river is from the mountain.

- math -
**MathMate**, Wednesday, August 1, 2012 at 4:19pm
If we assume that the river is at the same elevation of the base of the mountain, then

Width of the river

=distance of far shore - distance of near shore

=1780/tan(θ2)-1780/tan(θ1)

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