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Find the circumference of the circle. Use 3.14 for π. Round to the nearest unit.

(Show picture of circle with a diameter, with 21cm at one side)
A) 24cm
B) 66CM
C) 125cm
D) 69cm

Please help me understand, that means don't tell me the answer without explaining it!

Thanks

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10 answers
  1. The circumference is the distance around a circle.

    To find the circumference, use this formula.

    C = pi * diameter

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    Ms. Sue
  2. just remember your formula for the circumference of a circle of diameter d:

    C = πd

    π is defined as the ratio of the circumference to the diameter: π = C/d

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    oobleck
  3. Sooo Sorry if I am getting this wrong,
    is it 21 * 3.14?

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  4. Yes; 21 * 3.14

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    Ms. Sue
  5. Which is 65.94..... this rounded to the nearest unit will be 69 cm or 66 cm. I think it is 66 cm. Right?

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  6. Yes, 66 cm.

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    Ms. Sue
  7. Thank you for helping me understand it, Ms. Sue, and Oobleck!

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  8. You are welcome.

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    Ms. Sue
  9. Thanks mrs.sue I understand now

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  10. Ur awesome mrs sue!

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