Discussion
A cylinder of 70 mm diameter and 100 mm height develops as a rectangle whose length is about
Answer: D
Correct answer: 220 mm
The length of the rectangle is the circumference of the cylinder: \[ \pi d = \pi \times 70 = 220\ \mathrm{mm}. \] Using the radius instead gives 110, and using the diameter without pi gives 70 - both natural slips. The width of the rectangle is the height, 100 mm.
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