math
posted by 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.

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.
Respond to this Question
Similar Questions

physics
An object, after being released from its circular path, travels the distance OA in the same time it would have moved from O to P on the circle. The speed of the object on and off the circle remains constant at the same value. Suppose … 
Advanced Math
write the equation of the circle that satisfies each set of conditions. the center of the circle is on the xaxis, its radius is 1, and it passes through the point (square root of 2 over 2, square root of two over 2) 
NEED MAJOR HELP! *QUADRATIC EQUATIONS*
Write the equation for the circle with center at ( 8,  6) and radius of 10. (x+8)² + (y + 6)² = 10 (x+8)² + (y + 6)² = 100 (x8)² + (y  6)² = 100 Find the standard equation for the circle with center on the positive xaxis … 
GEOMETRY INSCRIBED ANGLES MULTIPLE CHOICE QUESTION
segment BC is tangent to circle A at B and to circle D at C. (Not drawn to scale) AB=10 BC=25 and DC=3. Find AD to the nearest tenth. Hint: Draw an auxiliary line from D to segment BA. {There are two circles, the larger one has point … 
mathematics
The circle x22x+y24y4=0 lies on the cartesian plane,question 2.1.1 equation of new circle which is the rotation of original circle through 180 degree around the origin...2.1.2 find equation of another circle which is the translation … 
mathematics
The circle x22x+y24y4=0 lies on the cartesian plane,question 2.1.1 equation of new circle which is the rotation of original circle through 180 degree around the origin...2.1.2 find equation of another circle which is the translation … 
mathematics
The circle x22x+y24y4=0 lies on the cartesian plane,question 2.1.1 equation of new circle which is the rotation of original circle through 180 degree around the origin...2.1.2 find equation of another circle which is the translation … 
mathematics
The circle x22x+y24y4=0 lies on the cartesian plane,question 2.1.1 equation of new circle which is the rotation of original circle through 180 degree around the origin...2.1.2 find equation of another circle which is the translation … 
math
A point,X ,is 25 feet from the center of a circle.If the diameter of the circle is 14 feet,what is the length (in feet)of a tangent from point X to the circle? 
MATH
How do i find the center of a circle using 3 points. Also need to find the radius and the equation of the circle.... My 3 points are (2,8) (4,6) (1,1) I found the Equation of the perpendicular bisector of the line between the first …