From trigonometry:

$\overline{){\mathbf{S}}{\mathbf{i}}{\mathbf{n}}{\mathbf{}}{\mathbf{\theta}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{o}\mathbf{p}\mathbf{p}}{\mathbf{h}\mathbf{y}\mathbf{p}}}$

Using angle properties, the vertically opposite angle is equal to θ.

What is the length, r_{m}, of the moment arm of the force F about point p in terms of r and θ?

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