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23 October, 19:34

The circumference of a circular swimming pool is 100 feet. If the radius of the pool is doubled, what will the new circumference be?

A. 200 ft.

B. 400 ft.

C. 700 ft.

D. 800 ft.

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Answers (1)
  1. 23 October, 22:12
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    circumference=2*π*r or π*d

    so divide by π and 2

    100/2=50/π=15.9154943092

    so 15.9154943092*2=31.8309886184

    31.8309886184*2*π=200ft
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