Posted by **Garrick** on Thursday, October 9, 2008 at 9:52pm.

-a circle with center at the point O(0,0) also has the point P(-2,3) on it. The equation of this circle is?

and a second question:

-A circle has a center of square root 5. The equation of this circle is?

Please help me.

- math -
**Reiny**, Thursday, October 9, 2008 at 10:47pm
the general equation of a circle with centre at (0,0) is

x^2 + y^2 = r^2

sub in your given point to find r^2 and you are done.

your second question makes no sense

the centre of a circle is a position, not a value.

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