Posted by **MW** on Monday, April 13, 2009 at 9:08pm.

From 2 points 400 yards apart on the bank of a straight river flowing due south, the bearings of a point on the opposite bank are 148 degrees and 28 degrees.

How wide is the river?

I am having a hard time understanding how this is set up.

Help please?

- Pre Calc -
**Reiny**, Monday, April 13, 2009 at 9:19pm
my diagram looked like this :

two vertical lines, points A and B 400 yards apart on the left line, with A above B.

Point P on the other line, so that angle PBA = 28º and angle PAB = 32º (the supplementary angle to 180)

now find the perpendicular distance from P to AB.

Does that help?

- Pre Calc -
**MW**, Monday, April 13, 2009 at 11:52pm
how do you find that? I have the angle measurments, but no side lengths.

Except for 400..

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