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Can a genius help me with this question? Am stuck on this question and show your working please.

1. Calculate the circumference of a circle with a radius of 3cm.

2. A circle with a radius of 10cm has a circumference of...?

3. Calculate a circumference of a circle with a diameter of 13cm.

4. A circle has a diameter of 9.5cm.What is the distance around the circle?


How do you calculate the circumference of a circle?

When would you use 2nr?

When would you use nd?

Come up with your own examples(at least two) to show how to calculate the circumference of a circle.

Respuesta :

snog

1. The circumference of a circle is 2Ï€r, and when we plug in 3 for r, we get 6Ï€.

2. We'll use the same formula and plug in 10 for r, giving us 20Ï€.

3. The formula we use in this case is πd, and when we plug in 13 for d, we get 13π.

4. Same formula from 3, we plug in 9.5 for d and get 9.5Ï€.

5. You can calculate the circumference of a circle using 2 formulas, C=2Ï€r (where r=radius and C=circumference) and C=Ï€d (where d=diameter and C is circumference).

6. You use 2Ï€r when the radius is given.

7. You use πd when the diameter is given.

8. 2 examples could be to use the 2 formulas.

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