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In a right circular cone, the cross-section made by a plane parallel to the base is a

  • A.circle
  • B.frustum of a cone
  • C.sphere
  • D.hemisphere

Answer: A

A right circular cone has a circular cross-section at every level, shrinking steadily toward the apex.

A plane parallel to the base therefore cuts the cone in a circle - smaller than the base, but a circle nonetheless.

The frustum is the three-dimensional solid left below that cut, not the cross-section itself; the cross-section is a flat, two-dimensional figure.

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