The distance between any two similar points on the adjacent gear teeth along the pitch circle is called the circular pitch, and it is equal to ______, Where d, the pitch diameter and N is the number of teeth.
1
\(p=\frac{d_p}{\pi N}\)
2
\(p=\frac{\pi d_p}{N}\)
3
\(p=\frac{d_p}{ N}\)
4
\(p=\frac{Nd_p}{\pi }\)