On a square handkerchief, nine circular designs each of radius 7 cm are made (see Fig. 12.29). Find the area of the remaining portion of the handkerchief.

A right circular cylinder just encloses a sphere of radius r (see Fig. ). Find surface area of the sphere.

From a circular sheet of radius 4 cm, a circle of radius 3 cm is removed. Find the area of the remaining sheet. (Takepi = 3.14)

From each corner of a square ofside 4 cm a quadrant of a circle of radius 1 cm is cut and also a circle of diameter 2 cm is cut asshown in fig. Find the area of the remaining portion of the square.

A right circular cylinder just encloses a sphere of radius r (see Fig.). Find curved surface area of the cylinder.

A circular cylinder has radius 3 mm and height 80 cm. Find the lateral surface area of the cylinder.

A square of side 3 cm is inscribed in a circle. Find the area of the shaded portion.

A right circular cylinder just encloses a sphere of radius r (see Fig.). Find ratio of the areas obtained in surface area of the sphere and curved surface area of the cylinder.

A right circular cylindr has base radius 8 cm and height 35 cm .Find the curved surface area of the cylinder.

Find the surface area of a sphere of radius 7 cm.