-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.

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  1. 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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