Three circles of radii `1, 2, 3` touch other externally. If a circle of radius` r` touches the three circles, then `r` is

Three circles of radii 1,2,3 touch other externally.If a circle of radiusr touches the three circles,then r is

Circles of radii 2,2,1 touch each other externally.If a circle of radius r touches all the three circles externally,then r is

Two circles of radius 1 and 4 touch each other externally.Another circle of radius r touches both circles externally and also one direct common tangent of the two circles.Then [(1)/(r)]=

The circles having radii 1,2,3, touch each other externally then find the radius of the circle which cuts the three circles orthogonally

Three circles of radius a, b, c touch each other externally. The area of the triangle formed by joining their centre is

Circles of radii 36 and 9 touches externally. The radius of the circle which touches the two circles externally and also their common tangent is

C_1 and C_2 are fixed circles of radii r_1 and r_2 touches each other externally. Circle 'C' touches both Circles C_1 and C_2 extemelly. If r_1/r_2=3/2 then the eccentricity of the locus of centre of circles C is

Three equal circles of radius unity touches one another.Radius of the circle touching all the three circles is:

Three circle of radius 6 cm touches each other externally. Then the distance of the centre of one circle from the line joining the centres of other two circles is equal to