Does any one know what 9 is?

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

What is the measure of one interior angle of a pentagon

The circle below is centered at the point (3, 1) and has a radius of length 2. what is the equation?