Question

Why did I get these wrong? I'm pretty sure they're both correct...

Answer 1

equation of a circle\[(x-a)^2+(y-b)^2=r^2\]

Answer 2

you have =4
which =2^2
so r = 2

Answer 3

But the radius was 4... so it had to be 16. @zzr0ck3r

Answer 4

equation is set = 4
this is not the radius
this is the square of the radius
so the radius is the square root of 4
this is 2

Answer 5

It says the radius is 2 but in the diagram the radius is 4.

Answer 6

but we are trying to say what is wrong with the diagram, given the equation

Answer 7

and given the equation, the diagram is wrong because it should have a radius of 2

Answer 8

Ohhhh I've got it now.

Answer 9

what is wrong that the radius is 2 and not 4

Answer 10

What about the second one?

Answer 11

I think you were doing it backwards:)

Answer 12

the second one you need to divide 4\(\sqrt{2}\) /2 and then square what you get

Answer 13

I feel like a doof, now XD Thanks you two.