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 the shaded region in Fig. 12.16. where ABCD is a square of side 14 cm.

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 rectangle whose length and breadth are 12 cm and 4 cm respectively.

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, if ABCD is a square o fside 14 cm and APD and BPC are semicircles.

Find the area of the rectangle whose sides are 10 cm, 12 cm respectively.

Two concentric circles have radii 20 cm and 15 cm. Find the area of ring shaped region

The area of a circle is equal to the sum of the areas of the two circles, whose radii are 5 cm and 12 cm respectively. Find the radius of the circle.

Calculate the area of the designed region in fig. common between the two quadrants of circles of radius 8 cm each.

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)