3 circles of radii `a, b, c (a lt b lt c)` touch each other externally and have x-axis as a common tangent then

Two circles of radii 4 cm and 9 cm respectively touch each other externally at a point and a common tangent touches them at a point P and Q respectively Then, area of square with one side PQ is

Two circles of radii 4 cm and 9 cm respectively touch each other externally at a point and a common tangent touches them at the points P and Q respectively. Then the area of a square with one side PQ, is

Two circles of radii a and b touch each other externally and theta be the angle between their direct common tangents (a>b>=2) then

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

Two circles of radii 4cm and 1cm touch each other externally and theta is the angle contained by their direct common tangents.Find sin(theta)/(2)+cos(theta)/(2)

Two circles of radii 5cm and 2cm touch each other externally and theta is the angle contained by their direct common tangents.Then sin theta is equal to (12sqrt(10))/(lambda) where lambda equals

If two circles of radius 4cm and 1cm touch each other externally then length of the direct common tangents is

Three circles whose radii are a,b and c and c touch one other externally and the tangents at their points of contact meet in a point. Prove that the distance of this point from either of their points of contact is ((abc)/(a+b+c))^(1/2) .

Three circles of radius a, b, c touch each other externally. The area of the triangle formed by joining their centre is