Posted by Shane on Sunday, March 10, 2013 at 5:59am.
A surveyor finds two points A and B on a hillside to be 114.6 metres apart(measured along the line of sight) and finds the angle of elevation from A to B to be 21 degrees.On his plans these points must be shown at their horizontal distance apart.Find this distance.

maths  Steve, Sunday, March 10, 2013 at 6:57am
d/114.6 = cos 21°
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