Two circles with radii `a` and `b` respectively touch each other externally . Let `c` be the radius of a circle that touches these two circles as well as a common tangent to the circles. Then

Two circle with radii r_(1) and r_(2) respectively touch each other externally. Let r_(3) be the radius of a circle that touches these two circle as well as a common tangents to two circles then which of the following relation is true

Two circles with radii 25 cm and 9 cm touch each other externally. The length of the direct common tangent is

Two circles with radii 3 cm and 2.5 cm touch each other externally then find the distance between their centre.

Two circles with radii 5 cm and 4.5 cm touch each other externally then find the distance between their centre.

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

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)]=

Two circles with radius 4 cm and 9 cm respectively touch each other externally. Their common tangent touches the circles at point P and Point Q respectively. Then, area of the square with side PQ is.

Two circles of radii 8 cm and 2 cm respectively touch each other externally at the point A. PQ is the direct common tangent of these two circles of centres O_(1) and O_(2) respectively. The length of PQ is equal to :