A circle `x^2 +y^2 + 4x-2sqrt2 y + c = 0` is the director circle of circle `S_1 and S_2`, is the director circle of circle `S_1`, and so on. If the sum of radii of all these circles is 2, then find the value of c.

A circle x^2+y^2+4x-2sqrt(2)y+c=0 is the director circle of the circle S_1a n dS_1 is the director circle of circle S_2, and so on. If the sum of radii of all these circles is 2, then the value of c is ksqrt(2) , where the value of k is___________

The circle x^2 + y^2 - 4x + 6y + c = 0 touches x axis if

If y = 2sqrt2x+c is a tangent to the circle x^(2) +y^(2) = 16 , find the value of c.

If the chord y=m x+1 of the circles x^2+y^2=1 subtends an angle of 45^0 at the major segment of the circle, then the value of m is

If the circle x^2+y^2=1 is completely contained in the circle x^2+y^2+4x+3y+k=0 , then find the values of kdot

If m(x-2)+sqrt(1-m^2) y= 3 , is tangent to a circle for all m in [-1, 1] then the radius of the circle is

The director circle of the ellispe x^(2)/9 + y^(2)/5 = 1

The line 2x-y+1=0 is tangent to the circle at the point (2, 5) and the center of the circle lies on x-2y=4. The radius of the circle is

The line 2x-y+1=0 is tangent to the circle at the point (2, 5) and the center of the circle lies on x-2y=4 . Then find the radius of the circle.