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A cylinder of 80 mm diameter is cut obliquely so that its generators vary from 60 mm to 100 mm. The development's stretch-out line measures about

  • A.160 mm
  • B.100 mm
  • C.251 mm
  • D.80 mm

Answer: C

Correct answer: 251 mm

The stretch-out line is the base circumference, unaffected by the oblique cut at the top: \[ \pi \times 80 = 251\ \mathrm{mm}. \] The cut changes the shape of the upper boundary into a sinusoidal curve, and changes nothing about the length of the base.

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