In the given figure two small circles touch each other externally at the centre of a big circle and these small circles are touched internally by a big circle of radius 74cm. Find the area of the shaded region

Three circles of equal radius 'a' cm touch each other. The area of the shaded region is :

If the four equal circles of radius 3 cm touch each other externally, then the area of the region bounded by the four circles is

Three circles of equal radius 'a' cm touch each other. The area of of the shaded region is :

The locus of the centre of a circle which touches two given circles externally is a

The given figure consists of four small semi-circles of equal radii and two big semi-circles of equal radil (each 42 cm). Find the area of the shaded region.

In the given figure, ABCD is a square of side 14 cm. Withcentres A, B, C and D four circles are drawn such that each circle touch externally two of the remaining three circles. Find the area of the shaded region.

The locus of the centre of a circle which touches two given circles externally is

Circles of radii 2,2,1 touch each other externally.If a circle of radius r touches all the three circles externally,then r is