Theory of Machine
The working depth of a gear is the radial distance from the

Addendum circle to the clearance circle
Pitch circle to the top of a tooth
Pitch circle to the bottom of a tooth
Top of a tooth to the bottom of a tooth

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Theory of Machine
Higher pairs are those which have

Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically
Two elements that permit relative motion

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