Question

http://prntscr.com/6cr0lg

Answer 1

@iGreen

Answer 2

Area of a circle:

\(A = \pi r^2\)

\(A = \pi 6^2\)

What's 6 * 6?

Answer 3

36

Answer 4

Yes, so A is correct.

Answer 5

Well to actually find it in a better way . .. you can find the squarre root of 36.

Answer 6

Also, remember \[A = \frac{ 1 }{ 4 } \pi d^2\] this can also be the area.

Answer 7

We know that the radius (r) will be squared, and in this situation it's alreayd been squared so we need to work backwards by finding the square root.

Answer 8

In which the square root of 36 is 6, so it would be a circle with a radius of 6.

Answer 9

That was my hint, meaning there is more than one right answer ;)

Answer 10

Now, the radius is half the diameter, so the radius of B is 3..

Plug that in:

\(A = \pi r^2\)

\(A = \pi 3^2\)

What's 3 * 3?

Answer 11

9

Answer 12

Yes, therefore B is incorrect.

Answer 13

Just find the radius's and multiply them by themselves..then see if you get 36.

Answer 14

What's the radius in C?

Answer 15

@Gokuporter

Answer 16

144 @iGreen

Answer 17

Yes, so that's incorrect..what about D?

Answer 18

144 :/

Answer 19

No, the DIAMETER is 12, the radius is half the diameter. @Gokuporter

Answer 20

Oh so 36

Answer 21

Yep, so D is also correct.

Your answers are A & D.

Answer 22

Thanks ^-^