## mekax 3 years ago WHAT IS THE AREA OF A CIRCLE WITH THE CIRCUMFERENCE OF 31.4CM?

1. pottersheep

Think about it. Whats the formula for circumference?

2. Lola9

$circumference = 2 \pi r$find r then $area = \pi r^2$

3. Harkirat

for finding area we need value of radius .... circumference = 2πr Area = πr^2

4. pottersheep

31.4CM =2πr r = 4.99

5. pottersheep

Get it? Cuz 31.4CM divided by 2 divided by π gives you r

6. pottersheep

Round that number to 5.

7. pottersheep

Now plug the new radius into the area formula

8. pottersheep

πr2

9. pottersheep

π5^2

10. pottersheep

= 78.5cm3

11. robtobey

pottersheep has just established that:$\text{area of a circle}=\frac{c^2}{4 \pi }$