EASY
JEE Main
IMPORTANT
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The radius of the circle ax2+2a-3y2-4x-7=0 is

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Important Questions on Circle

HARD
JEE Main
IMPORTANT
The equation of the circle passing through 12, -1 and having a pair of straight lines x2-y2+3x+y+2=0 as its two diameter is 
MEDIUM
JEE Main
IMPORTANT
The equation of the circle passing through the point of intersection of the circle x2+y2=4 and the line 2x+y=1 and having minimum possible radius is
MEDIUM
JEE Main
IMPORTANT
If the circumference of the circle x2+y2+8x+8y-b=0 is bisected by the circle x2+y2-2x+4y+a=0, then a+b equals to
MEDIUM
JEE Main
IMPORTANT
If two circles x2+y2+ax+by=0 and x2+y2+kx+ly=0 touch each other, then
HARD
JEE Main
IMPORTANT
The circle x2+y2- 6x- 10y+p=0 does not touch nor intersect the coordinate axes and the point 1, 4 lies inside the circle then
HARD
JEE Main
IMPORTANT
The chord of contact of tangents from three points P, Q, R to the circle x2+y2=c2 are concurrent, then P, Q, R
EASY
JEE Main
IMPORTANT
The radical axis of three circles, taken in pairs
MEDIUM
JEE Main
IMPORTANT
The radical centre of the three circles x2+y2+x+2y+3=0, x2+y2+2x+4y+5=0 and x2+y2-7x-8y-9=0 is