Question

What is the circumference of this circle?

Answer 1

there is a fundamental relationship between circumference and diameter\[\pi=\frac Cd\]

Answer 2

I got 19.625 Isn't Circumfrence Pi*r^2

Answer 3

And since it gives the diameter it is Pi*D

Answer 4

I'm confused, so is it D or C?

Answer 5

Area is not Circumference ....

Answer 6

you might be confusing the elements of pi, r, and 2
\[\pi~r^2\not=\pi~2r\]

Answer 7

since the diameter is twice the radius: 2r = d

Answer 8

\[\pi=\frac Cd~\to~d\pi=C\]

Answer 9

Ok thank you

Answer 10

I pretty sure I am right. I just looked up the equation for circumference and it is Pi x Diamiter

Answer 11

pi r^2 is not correct

pi 2r = pi d is correct

so your "correctness" depends on how we are to interpret your post :)