对于直角三角形:
合力矢量的方向使用: tanθ=oppositeadjacent\tan \theta = \frac{\text{opposite}}{\text{adjacent}}tanθ=adjacentopposite θ=tan−1(oppositeadjacent)\theta = \tan^{-1} \left( \frac{\text{opposite}}{\text{adjacent}} \right)θ=tan−1(adjacentopposite)