`A B C D` is a flower bed. If `O A=21\ m` and `O C=14\ m` , find the area of the bed. `(T a k e\ \ pi=22//7)`

In the given figure, PQSR represents a flower bed. If OP=21m and OR=14m , find the area of the flower bed.

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)

In Fig. 15.72 (a) , O A B C is a square of side 7 cm. If O A P C is a quadrant of a circle with centre O , then find the area of the shaded region. (U s e\ \ pi=22//7) (FIGURE)

In Fig. 15.63, A B C D is a trapezium with A B D C and /_B C D=60o . If B F E C is a sector of a circle with centre C and A B=B C=7\ c m and D E=4\ c m , then find the area of the shaded region (U s e\ \ pi=(22)/7\ a n d\ sqrt(3)=1. 732) .

Two circular pieces of equal radii and maximum area, touching each other are cut out from a rectangular card board of dimensions 14\ c mxx7\ c m . Find the area of the remaining card board. (U s e\ \ pi=22//7)

In Fig. 15.99, a square O A B C is inscribed in a quadrant O P B Q of a circle. If O A=21\ c m , find the area of the shaded region. (FIGURE)

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)

Triangles A B C and D E F are similar. If area ( A B C)=36 c m^2 , area ( D E F)=64 c m^2 and D E=6. 2 c m , find A Bdot (ii) If A B=1. 2 c m and D E=1. 4 c m , find the ratio of the areas of A B C and D E F .

In Fig. 15.103, from a rectangular region A B C D with A B=20\ c m , a right triangle A E D with A E=9\ c m and D E=12 c m , is cut off. On the other end, taking B C as diameter, a semicircle is added on outside the region. Find the area of the shaded region. (U s e\ \ pi=22//7)

Find the area of the shaded region in Fig. 15.72, if A C=24\ c m , B C=10\ c m and O is the centre of the circle. (U s e\ \ pi=3. 14) (FIGURE)