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The diameter of a sphere is decreased by...

The diameter of a sphere is decreased by `25%.` By what per cent does its curved surface area decrease ?

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Knowledge Check

  • The radius of a circle is decreased by 10%. Its area is changed by

    A
    0.12
    B
    0.1
    C
    0.19
    D
    0.81

  • The formula to find the curved surface area of a sphere is

    A
    `pi r^(2)`
    B
    `2 pi r^(2)`
    C
    `4 pi r^(2)`
    D
    `3 pi r^(2)`

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