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$$\begin{align}
\tau=rF\sin \theta &
\end{align}
$$
Where:
- $r$ is the radius between the point at which the force is applied and the pivot point
- $F$ is the forced applied
- $\theta$ is the angle made between the force and perpendicular to the radius from the pivot, i.e. such that $F\sin \theta$ represents the component of $F$ which is perpendicular to the radius between the point of application and the pivot.
Note instead of doing the perpendicular component of force method (2), you can do perpendicular distance to line of action of force (1). This may or may not come up.
