# 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

Thanks

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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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