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12 March, 15:28

A circular disc has a circumference of 16pi meters. if we multiply the radius of the circular disc is by 10, what is the circumference of the new disc?

A. 160pi m

B. 260pi m

C. 413pi m

D. 157pi m

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Answers (1)
  1. 12 March, 15:31
    +1
    The circumference of the new disc 160Π that is 10 time of old circumference.

    Step-by-step explanation:

    Given,

    Circumference of circular disc = 16Π (pi = Π)

    Let, the radius of the circle be 'r'

    Formula

    The circumference of a circle with r radius = 2 Π r

    According to the problem,

    2 Π r = 16Π

    or, 2r = 16 (by eliminating the value of Π from both the side)

    or, r = 8

    Now, we multiply the radius by 10

    so, the new radius is 8 X 10 = 80

    Now the circumference = 2 Π X 80

    = 160Π

    Hence, the new circumference also will be 10 times of the older one.
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