Question 861888
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Hi
sin = opp/hyp 
30-60-90 right triangle:
Triangle: sides &#8730;3 and 1, hyp = 2   |note:{{{ sqrt(3+1) = 2}}}
 sin(60) = &#8730;3/2
<img src=" http://upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Trigonometry_triangle.svg/200px-Trigonometry_triangle.svg.png ">