Discussion
A cylinder 50 mm in diameter and 70 mm high standing on its base offers a longest straight cut of about
Answer: D
Correct answer: 86.0 mm
The longest straight line within the cylinder runs from a point on one rim to the diametrically opposite point on the other: \[ \sqrt{50^2 + 70^2} = \sqrt{7400} = 86.0\ \mathrm{mm}. \] It is the diagonal of the rectangular axial section, so it exceeds both the height and the diameter.
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