A. (a+b)2=c
B. (a+b)2=2c
C. (a-b)2=c
D. (a-b)2=2c
The number of common tangents that can be drawn to the circles x2+y2=1 and x2+y2-2x-6y+6=0 is
The lines 2x-3y=5 and 3x-4y=7 are two diameters of a circle of area 154 sq unit. Then the equation of this circle is
The circle x2+y2-4x+4y-1=0 cuts the positive coordinate axes in A and B respectively. The equation to the diameter of the circle perpendicular to the chord AB is
If the equation of the circle cutting orthogonally the circles x2+y2-6x=0, x2+y2+4x+3y+1=0 and which has its centre on the line x+2y=5 is x2+y2-2ax-2by+c=0 then the descending order of a, b, c is
The radius of the circle passing through the point (6, 2) and two of whose diameters are x+y=6 and x+2y=4 is
The locus of the midpoints of the chords of the circle 4x2+4y2-12x+4y+1=0 which subtend an angle of π/3 at its centre is a circle of radius
Let P be a point on the circle x2+y2=9, Q a point on the line 7x+y+3=0, and the perpendicular bisector of PQ be the line x-y+1=0. Then the coordinates of P are
If the of the circle passing through the points (3,4),(3,2),(1,4) is x2+y2+2ax+2by+c=0, then the ascending order of a, b, c is
(1, 2) is a point on the circle x2+y2+2x-6y+5=0 which is orthogonal to x2+y2=5. The conjugate point of (1, 2) w. r. to the circle x2+y2 =5 and which lies on the first circle is
Let C1=x2+y2-2x-4y=0, C2=x2+y2+2x+10y=0 and L=2x+7y+7=0 Then L is the