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

The given figure consists of and four small semi-circles of A B equal; radii and two big len semi-circles of equal radii (each 42cm). Find the area and perimeter of Two the shaded region 25. In 19. The total surface area of a hollow cylinder which is open from both sides is 3575cm

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 fig, APB and CQD are semi circles of diameter 7 cm each, while ARC and BSD are semicircles of diameter 14 cm each. Find the perimeter of the shaded region. (Use pi=(22)/(7))

In the given figure ABCD is a rectangle. It consists of a circle and two semi-circles each of which are of radius 5 cm. Find the area of the shaded region. Give your answer correct to three significant figures.**

In Figure, there are shown sectors of two concentric circles of radii 7cm and 3.5cm. Find the area of the shaded region. (pi=(22)/7)

The given figure consists of four half circles and two quarter circles. If OA OB=OC=OD=14 cm. Find the area of the shaded region.

In the give figure, the sectors of two concentric circles of radii 7 cm and 3.5 cm are shown. Find the area of the shaded region.

In the given figure,diameter of larger semi- circle is 14cm and radius of smaller semi- circle is 3.5cm. find :