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If a circular paper disc is trimmed in such a way that its circumference is…

If a circular paper disc is trimmed in such a way that its circumference is reduced in the ratio 2:5, In what ratio is the surface area reduced?

  • A.
    8 : 125
  • B.
    2 : 5
  • C.
    8 : 25
  • D.
    4 : 25
  • E.
    4 : 10
Correct Answer: Option D
Explanation

If the circumference of the circular Fig. paper disc is reduced in the ratio 2 : 5, then the surface area must be reduced by ratio 22 : 52
= 4 : 25