# Equation of circles

• November 24th 2012, 03:00 AM
Thorpelizts
Equation of circles
Atached the question....

i know how to do part a, but not b and c. Do I sub in Or something? Like sub in x=3?
• November 24th 2012, 03:39 AM
Plato
Re: Equation of circles
Quote:

Originally Posted by Thorpelizts
Atached the question....
i know how to do part a, but not b and c. Do I sub in Or something? Like sub in x=3?

You say you have done part (a).
Then you should have an equation that looks like:
$(x-h)^2+(y-k)^2=r^2$ where $(h,k)$ is the center and $r$ is the radius.

That is also the way to do part (c), only 'unpack it'

As for part (b), you need to show that the point $(-3,k)$ is on the circle.
• November 24th 2012, 03:54 AM
Thorpelizts
Re: Equation of circles
So here's my a, how do I unpack it?
• November 26th 2012, 12:29 AM
FranciscoOlsen
Re: Equation of circles
That is also the way to do part (c), only 'unpack it'

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