Question

The circumference of a circle is 12π cm. What is the circle's area?

Answer 1

Circumference of a circle is 2*radius*π.
Area of a circle is π * radius^2.

Answer 2

the answer choices are 6picm^2, 12picm^2, 36picm^2, 144picm^2

Answer 3

We can get the radius by solving the equation 12π = 2*radius*π
For this equation, what is the radius?

Answer 4

6?

Answer 5

Yes.
Now use the equation area = π * r*r to find the area.

Answer 6

so the answer is 12...?

Answer 7

Not exactly.
What is 6 * 6?
Then multiply that by π.

Answer 8

in the answer choices you dont multiply by pi yet

Answer 9

so 36?

Answer 10

Yes.

Answer 11

good job