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Which change keeps the curved surface area of a cone the same?

Class 9Surface Area of a ConeMensuration
  • ADouble the radius and halve the slant height
  • BAdd 2 cm to both
  • CHalve the radius only
  • DDouble both radius and slant height

Step-by-Step Solution

CSA = π, so the product is unchanged. All other options change .
Answer: A) Double the radius and halve the slant height

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