Find the area of ihe segment AYB shown in Fig. 12.9 if radius of the circle is 21 cm and `angle AOB=120^@`.(Use `pi=22/7`)

Find the area of the shaded region in Fig. 12.20, if radii of the two concentric circles with centre O are 7 cm and 14 cm respectively and angle AOC=40^@ .

Find the area of sector of a circle with radius 6 cm, if angle of the sector is 60^@ .

A square is made inside the circle. Find the area of that portion of the circle which is not inside the square, if the radius of the circle is 10 cm. ( pi = 3.14 )

A round table cover has six equal designs as shown in fig. If the radius of the cover is 28 cm, find the cost of making the designs at the rate of ? 0.35 per cm^2 . (use sqrt 3=1.7)

Find the degree measure of the angle subtended at the centre of a circle of radius 7 cm by an arch of 22 cm. (Use pi = (22)/(7) )

Find the area of the shaded region in Fig., if PQ = 24 cm, PR = 7 cm and O is the centre of the circle.

Find the area of the shaded design in Fig. 12.17, where ABCD is a square of side 10 cm and semicircles are drawn with each side of the square as diameter. (Use pi = 3.14)

Find the area of the sector of a circle with ratdius 4 cm and of angle 30^@ . Also, find ihe area of the corresponding major sector (Use pi = 3.14).

Find the area of the following circles, given that: radius = 14 mm (Take pi = 22/7)