Question 1199832
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From the top of a building, you look down at an object on the ground. 
If your eyes are 20 meters above the ground and the angle of depression is 50° 
how far is the object from you?
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<pre>
You have a right-angled triangle.


20 m is its leg;  50° is the angle in the triangle, opposite to this leg.
The hypotenuse "H" is "how far".


So, you write  20 = H*sin(50°) and find

    H = {{{20/sin(50^o)}}}.


After that, you use your calculator and get the answer.
</pre>

You are fully instructed.