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What radius is used to strike the arc of a cone's development?

  • A.the diameter of the base circle
  • B.the slant height of the cone
  • C.the vertical height of the cone
  • D.the radius of the base circle

Answer: B

Correct answer: the slant height of the cone

A development consists entirely of true lengths, and the true distance from apex to base rim along the surface is the slant height. The vertical height is the perpendicular from apex to base and lies inside the solid, so it appears nowhere on the surface and cannot bound the pattern.

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