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What determines the longest possible straight cut across a right circular cylinder standing on its base?

  • A.a plane perpendicular to the axis at mid-height
  • B.a plane containing the axis of the cylinder
  • C.a plane tangent to the curved surface
  • D.a plane through opposite base points and the far top edge

Answer: D

The greatest chord runs diagonally from one base circle to the opposite point on the top, combining the full height with the full diameter. Its length is the hypotenuse on those two, which exceeds both the height and the diameter.

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