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The locus of the centre of a variable circle touching two circles of radius r1 and r2 externally which also touch each other externally is a conic. The eccentricity of the conic, if r1r2=3+22 is

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Important Questions on Circle

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STATEMENT-1: If three circles which are such that their centres are non-collinear, then exactly one circle exists which cuts the three circles orthogonally.

STATEMENT-2: Radical axis for two intersecting circles is the common chord.

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A circle C1 has radius 2 units and a circle C2 has radius 3 units. The distance between the centres of C1 and C2 is 7 units. If two lines, one tangent to both circles and the other passing through the center of both circles, intersect at point P which lies between the centers of C1 and C2, then the distance between P and the centre of C2 is
HARD
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IMPORTANT
If real numbers x and y satisfy x2+y2-16x+30y+280=0, then maximum value of x2+y212 is
MEDIUM
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A region in the xy -plane is bounded by the curve y=25-x2 and the line y=0. If the point (a, a+1) lies in the interior of the region, then
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If a circle has two of its diameters along the lines x+y=5 and x-y=1 and has area 9π, then the equation of the circle is
EASY
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Choose the correct statement about two circles whose equations are given below:

x2+y2-10x-10y+41=0

x2+y2-22x-10y+137=0

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If the circle x2+y2-6x+2y=28 cuts off a chord of length λ units on the line 2x-5y+18=0, then the value of λ is
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The equation of the circle whose radius is 5 and which touches the circle x2+y2-2x-4y-20=0 externally at the point 5, 5 is