Machine Design
The dedendum is the radial distance from the

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
Addendum circle to the clearance circle

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Machine Design
The face of the tooth is the

Surface of the tooth above the pitch surface
Surface of the tooth below the pitch surface
Width of the tooth measured along the pitch circle
Surface of the top of the tooth

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