Question

What is the circle's equation?

Answer 1

I believe it's either B or D...

Answer 2

the equation of a circle centered at \((a,b)\) with radius \(r\) is

\(r^2=(x-a)^2+(y-b)^2\)

Answer 3

A: Silly
B: Silly
C: Plausible, but 2?
D: Plausible.

Answer 4

lol

Answer 5

Remember what I said about the pythagorean theorem?

Answer 6

plug in a b and r into the equation I posted and the answer is obvious

Answer 7

Yea, but when I plug in 4 for the (2r^2) part, I get 64...

Answer 8

Why do you think there is a "2" in there?

4*4 = 16 -- Done.

"Plug In" doesn't exist.

Answer 9

\((x-0)^2+(y-0)^2=4^2 \ = \ ?\)

Answer 10

16....

Answer 11

\((x-0)^{2} = x^{2} \ne 0\)

Answer 12

Thanks for explaining it. :)