Physics
posted by Kyle .
A 171N child sits on a light swing and is pulled back and held with a horizontal force of 73.5N. The magnitude of the tension force of each of the two supporting ropes is?

Let T be the singlerope tension and A be the angle from vertical
2T sinA = 73.5
2T cosA = Weight = 171
Square and add both equations
4T^2 = 73.5^2 + 171^2
Solve for T 
186.13

546545

satshdf

the answer is 94. I don't know how to do the problem though.
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