In Fig. 15.82, `A B C D` is a rectangle, having `A B=20\ c m` and `B C=14\ c m` . Two sectors of `180o` have been cut off. Calculate: (i) the area of the shaded region. (FIGURE) (ii) the length of the boundary of the shaded region.

In Fig. 15.98, A B C is a right angled triangle in which /_A=90o , A B=21\ c m and A C=28\ c m . Semi-circles are described on A B ,\ B C and A C as diameters. Find the area of the shaded region. (FIGURE)

In Fig. 15.93, A B C D is a rectangle with A B=14\ c m and B C=7\ c m . Taking D C ,\ B C and A D as diameters, three semi-circles are drawn as shown in the figure. Find the area of the shaded region. (FIGURE)

In Fig 31, A B C D is a rectangle with dimensions 32 m by 18 m. A D E is a triangle such that E F_|_A D and E F=14\ c mdot Calculate the area of the shaded region.

In Fig. 15.75, O E=20\ c m . In sector O B F T , square O E F G is inscribed. Find the area of the shaded region. (FIGURE)

In the given figure, ABCD is a rectangle with length = 36 m and breadth = 24 m. In Delta ADE , EFbotAD and EF = 15 m. Calculate the area of the shaded region

In Fig. 32, A B C D is a rectangle of length A B=40\ c m and breadth B C=25\ c mdot If P , Q , R , S be the mid-points of the sides A B ,\ B C ,\ C D\ and \ D A respectively, find the area of the shaded region.

A paper is in the form of a rectangle A B C D in which A B=20\ c m and B C=14\ c mdot A semicircular portion with B C as diameter is cut off. Find the area of the remaining part.

In Fig. 15.69, A B and C D are two diameters of a circle perpendicular to each other and O D is the diameter of the smaller circle. If O A=7\ c m , find the area of the shaded region. (FIGURE)

If Figure, there are three semicircles, A, B and C having diameter 3cm each, and another semicircle E having a circle D with diameter 4.5cm are shown. Calculate: the area of the shaded region. the cost of painting the shaded region at the rate of 25 paise per c m^2 , to the nearest rupee.

In Fig. 15.101, A B C D is a trapezium of area 24. 5\ c m^2 . In it, A D B C , /_D A B=90o , A D=10\ c m and B C=4\ c m . If A B E is a quadrant of a circle, find the area of the shaded region. (T a k e\ pi=22//7) . (FIGURE)