The relation between angular displacement \( \theta \), radius \( r \), and arc length \( s \) is:

1. The relation between angular displacement \( \theta \), radius \( r \), and arc length \( s \) is:

1. \( \theta = \frac{r}{s} \)2. \( s = r\theta \)3. \( r = \frac{\theta}{s} \)4. \( s = \theta^2 r \)