Question

Which circles have an area of 16pi in^2?

Choose all answers that are correct.

A.
a circle with a radius of 2 in.

B.
a circle with a radius of 4 in.

C.
a circle with a diameter of 8 in.

D.
a circle with a diameter of 16 in.

Answer 1

Do you know the formula for the area of a circle?

Answer 2

Yes Mr. Bean. xD :P No offense. Just pulling your legs.

Answer 3

Ok what gives us 16 when we square it?

Answer 4

8

Answer 5

Think again.. 8 squared doesn't equal 16.

Answer 6

4.

Answer 7

o3o yep your right 4x4=16 ^~^

Answer 8

Sorry. I switched accounts. That account is lagging.

Answer 9

area = pi r^2
pi r^2=16 pi
r^2=16
r= sqrt(16)=4

Answer 10

@jabez177

Answer 11

Awesome job!

Answer 12

Thanks for your help!