A. 2x2+2y2-x-7y=0
B. 9x2+9y2-14x-30y+16=0
C. 9x2+9y2-52x+46y+105=0
D. x2+y2+8x-2y+1=0
The length of the intercept made by the circle x2+y2+10x-12y-13=0 on y-axis is
The angle between a pair-of tangents drawn from a point P to the circle x2+y2+4x-6y+9sin2α+13cos2 α=0 is 2α.The equation of the locus of the point P is
The equation of the circle with centre at (-3, 4) and touching y-axis is
The centre of the circle (1+m2)(x2+y2)-2cx-2cmy=0 is
The equation of the circle which cuts orthogonally the three circles x2+y2+4x+2y+1=0, 2x2+2y2+8x+6y-3=0 , x2+y2+6x-2y-3=0 is
If the lines 3x-4y-7 =0and 2x-3y-5=0 are two diameters of a circle of area 49π sq unit. Then the equation of this circle is
The number of common tangents to the circles x2+y2+2x+8y-23=0, x2+y2-4x-10y+19=0 is
If the lines 2x-3y=5 and 3x-4y=7 are two diameters of a circle of radius 7, then the equation of the circle is
The centre of the circle x2+y2-4x-2y-4=0 is
If the two circles (x-2)2+(y-3)2=r2and x2+y2-10x+2y+17=0 intersect in two distrinct points then