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When the curved surface of a cylinder is opened into a rectangle, the length of that rectangle equals:

Class 8Surface Area of a CylinderMensuration
  • AThe height h
  • BThe circumference of the base, 2πr
  • CThe diameter
  • DThe base area π

Step-by-Step Solution

The edge that wrapped once around the circular base becomes the long side, so its length is the circumference 2πr; the other side is the height h.
Answer: B) The circumference of the base, 2πr

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