A circle x2+y2+2gx+2fy+c=0x^2 + y^2 + 2gx + 2fy + c = 0x2+y2+2gx+2fy+c=0 is orthogonal to x2+y2=k2x^2 + y^2 = k^2x2+y2=k2. What is the condition on ccc?
c=k2c = k^2c=k2
c=−k2c = -k^2c=−k2
c=2k2c = 2k^2c=2k2
c=0c = 0c=0