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Comparing the zone with the lune method for a sphere, the zone method treats each piece as

  • A.a frustum of a cone
  • B.a cylindrical strip between meridians
  • C.a flat triangular panel
  • D.a portion of a second smaller sphere

Answer: A

Horizontal slices are shallow enough for a conical frustum to approximate them, and frusta develop exactly. The lune method instead cuts vertical segments between meridian planes and treats each as a cylindrical strip.

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