Garrick

-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.

Do you know any sites that have circumcenter, orthocenter or centroid word problems?? i really need the practise.. please help!

If the area of triangle wxy is 22 square inches what is the area of wxyz