Discussion
A helix of 40 mm pitch developed over three complete turns gives a straight line whose vertical rise is
Answer: D
Correct answer: 120 mm
The pitch is the rise for one turn, so three turns rise \[ 3 \times 40 = 120\ \mathrm{mm}. \] Developed on the flat the helix becomes a straight line, the hypotenuse of a triangle whose vertical side is that 120 mm and whose horizontal side is three circumferences - which is how a helical development is set out.
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