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= 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 =

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

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

The circles x^(2)+y^(2)-6x-8y=0 and x^(2)+y^(2)-6x+8=0 are

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)

Show that the circles x^(2)+y^(2)-8x-2y+8=0 and x^(2)+y^(2)-2x+6y+6=0 touch each other and find the point of contact.