Help please it’s due tomorrow

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

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)