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This is a way of getting greater accuracy, and attaining the higher grades.

The question states, tan(angle) = 3/4

So instead of using tan^-1 (3/4) to get the angle with many digits, round it off and losing accuracy, she said:

Drawing the triangle out results in:

http://imgplace.com/directory/dir51/1172694216_triangle.JPG

Using pythag you can work out the other side.

Now you have:

sin(angle) = 3/5

cos(angle) = 4/5

I have worked out the statement:

2Tsin(angle) = 3mg

However, how do I apply what was attained from the triangle to this question?

Thanks.