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27 March, 05:04

An outside circular ring has a circumference of 200 cm. What is the circumference of an inner ring which is 25 cm shorter in radius? Both circles have the same center.

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Answers (2)
  1. 27 March, 06:35
    0
    First, find the circumference of the outer ring. The formula to be used is

    C = 2*pi*r

    200 = 2*pi*r

    r = 31.83 cm

    Since, both rings are concentric, just subtract 25 from the radius of the outside ring to find the radius of the inner ring

    radius of inner ring = 31.83 - 25

    radius of inner ring = 6.83

    Then, we use this radius to the formula to find its circumference:

    C = 2*pi*6.83

    C = 42.91 cm
  2. 27 March, 08:05
    0
    Find circumferences

    c=2pir

    200=2pir

    divide by 2

    100=pir

    divide by pi

    100/pi=r

    aprox

    31.83099=r

    25 les than that is

    6.83099

    c=2pir

    c=2*3.141592*6.83099

    c=42.9204

    about 43cm
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