X2 + Y2 - 49 = 0
X2 + Y2 +12x + 20 = 0
2X2 + 2Y2 - 50 = 0
X2 + Y2 + 8x + 2y - 19 = 0
X2 + Y2 - 16 = 0
X2 + Y2 - 8x -6y - 39 = 0
X2 + Y2 - 9 = 0
X2 + Y2 +2x -6y -15 = 0
X2 + Y2 – 6x -7 = 0
X2 +Y2 – 10x + 4y -20 = 0
X2 + Y2 – 4x - 2y + 1 = 0
X2 + Y2 + 2x + 14y + 49 = 0
C(-1,3), r = 5
C(-6,0), r = 4
C(-4,-1), r = 6
C(5,-2), r=7
C(-1,-7), r=1
C(0,0), r=4
C(3,0), r=4
C(4,3), r=8
C(0,0), r=7
C(2,1), r=2
C(0,0), r=5
C(0,0), r=3
