The centre distance between two meshing involute gears is equal to
(a) sum of base circle radii/cosɸ
(b) difference of base circle radii/cosɸ
(c) sum of pitch circle radii/cosɸ
(d) difference of pitch circle radii/cosɸ
I had been asked this question in an interview for internship.
Enquiry is from Comparison Between Involute and Cycloidal Gears topic in section Toothed Gearing & Gear Trains of Machine Kinematics