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For that same cycloid the height of the arch is

  • A.94.2 mm
  • B.30 mm
  • C.15 mm
  • D.60 mm

Answer: B

Correct answer: 30 mm

The tracing point rises from the line to the top of the circle and back, so the height of the arch is the full diameter of the rolling circle, 30 mm. Base and height together, \( \pi d \) by \( d \), fix the arch completely and are the two dimensions to lay out first.

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