Jean camps beside a wide river and wonders how wide it is. She spots....?

L

linlyons

New member
at 45° the distance up stream is the same as the distance across.
it's a 45-45-90 right triangle.

180 strides = 180 yards

180*(36/39.39) = 164.5 meters
 
...a large rock on the bank directly across from her. She then walks upstream until she judges that the angle between her and the rock, which she can still see clearly, is now at an angle of θ = 45° downstream (see figure). Jean measures her stride to be about one yard long. The distance back to her camp is n = 180 strides. About how far across, both in yards and in meters, is the river?

I just can't get this answer right, any help is appreciated!! :)
 
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