Question 1083848
<pre>
There is no way to tell which of these two cases it is:

{{{drawing(400,6000/37,-32,42,-5,25,
locate(-20,0,stream), locate(-32,10,road),locate(-15,13,fence),
locate(20,0,stream),locate(10,8,road),locate(32,8,fence),
locate(14,3,theta), locate(-25,3,theta="90°"),locate(22.5,11,"90°"),
triangle(-27,0,-27,20,0,0), triangle(10,0,37,0,10+400/27,102475/7627) )}}}

If it's the first way, the stream makes a 90° angle with the road.

If it's the second way,

{{{cos(theta)}}}{{{""=""}}}{{{adjacent/hypotenuse}}}{{{""=""}}}{{{road/stream}}}{{{""=""}}}{{{20/27}}}

{{{theta}}}{{{""=""}}}{{{drawing(72,40,0,2,-1,1.7,locate(0,.9,"cos"^(-1)),locate(1.4,1.3,(20/27)) )}}}

{{{theta}}}{{{""=""}}}{{{"42.2054464°"}}}

Edwin</pre>