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The development of a right cylinder's lateral surface is

  • A.a triangle of the cylinder's height
  • B.an annulus between two concentric circles
  • C.a rectangle
  • D.a sector of a circle

Answer: C

Its length is the base circumference and its height the axis length, since every generator is equal and perpendicular to the base. Cutting the cylinder obliquely turns the top edge of that rectangle into a curve while the base edge stays straight.

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