The difference of sixty and a number

Which statements about these triangles is true

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

Plzzz answer both questions and i will give you 100 points