This is (relatively) simple problem in vector mechanics. What you need to do is draw a diagram of the system you are talking about, including angles. You then have to draw the horizontal and vertical components of the load (force) on each anchor point. You can calculate these using trigonometry (i.e. sin, cos, tan), and using the formula Force = Mass x Acceleration. Acceleration in this case is gravity (9.81m/s^2).
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