For an involute spur gear, it is given that the module of the gear is 4 mm and the number of teeth on the gear is 20. Then
1
The circular pitch of the gear is 0.25 mm-1
2
The diametral pitch of the gear is 12.56 mm
3
The pitch diameter of the gear is 80 mm
4
The product of the diametral pitch and circular pitch is π