Find the condition if the circle whose equations are `x^2+y^2+c^2=2a x` and `x^2+y^2+c^2-2b y=0` touch one another externally.

Find the condition if the circle whose equations are x^(2)+y^(2)+c^(2)=2ax and x^(2)+y^(2)+c^(2)-2by=0 touch one another externally.

The circles whose equations are x^2+y^2+c^2=2ax and x^2+y^2+c^2-2by=0 will touch one another externally, if :

The circles whose equations are : x^2+y^2+c^2=2ax and x^2+y^2+c^2-2by=0 will touch each other externally if:

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

Write the condition so that circles x^(2)+y^(2)+2ax+c=0 and x^(2)+y^(2)+2by+c=0 touch externally.

The circleS x^(2)+y^(2)+2 a x+c^2=0 and x^(2)+y^(2)+2 b y+c^2=0 touch if

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: