Discussion
The pitch of a helix is the distance advanced along the axis in
Answer: C
Correct answer: one complete revolution
The pitch is the axial advance for one full turn, so the helix rises by its pitch each time it goes round. Together with the diameter it fixes the helix completely: the helix angle is the arctangent of the pitch divided by the circumference, and every property of a screw thread follows from those two dimensions.
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