If the circles `x^2+y^2=a\ a n d\ x^2+y^2-6x-8y+9=0` touch externally then `a=` a. 1 b. `-1` c. `21` d. 16

If the circles x^(2)+y^(2)=a and x^(2)+y^(2)-6x-8y+9=0 touch externally then a= a.1 b.-1 c.21 d.16

If the circles x^(2)+y^(2)=a^(2), x^(2)+y^(2)-6x-8y+9=0 touch externally then a=

If the circles x^(2)+y^(2)=a^(2), x^(2)+y^(2)-6x-8y+9=0 touch externally then a=

If the circles x^(2) +y^(2) = a and x^(2) + y^(2) - 6x - 8y + 9 = 0 touch externally then a =

If the circles x^2+y^2=9 and x^2+y^2+8y+c=0 touch each other, then c is equal to:

If the circles x^(2) + y^(2) = k and x^(2) + y^(2) + 8x - 6y + 9 = 0 touch externally, then the value of k is

If the circles x^(2) + y^(2) = a^(2) and x^(2) + y^(2) - 6x - 8y + 9 = 0 touches each other externally, then a = …….

If the circles x^(2)+y^(2)=9 and x^(2)+y^(2)+8y+C=0 touch each other,then c is equal to

Show that the circles x^(2) + y^(2) + 2x = 0 and x^(2)+ y^(2) - 6 x -6 y + 2 = 0 touch externally at the point (1/5,3/5)

If the circle x^(2) +y^(2) -6x -8y+( 25-a^(2) ) =0 touches the axis of x, then a equals.