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If the curved surface of a cone is cut along a slant line and laid flat, what shape do you get?

Class 9Surface Area of a ConeMensuration
  • AA rectangle
  • BA sector of a circle
  • CA full circle
  • DA triangle

Step-by-Step Solution

The slant height becomes the radius of the flat piece and the base circumference becomes its arc, so the opened curved surface is a sector of a circle.
Answer: B) A sector of a circle

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