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 Figure, 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.

Find the areas of the shaded region in the Fig. 15.39. (FIGURE)

Find the areas of the shaded region in the Fig.15.39.( FIGURE)

In Fig. 15.77, P Q R S is a square of side 4 cm. Find the area of the shaded region. (FIGURE)

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. 15.98, 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., a square OABC is inscribed in a quadrant OPBQ. If OA = 20 cm, find the area of the shaded region.

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. 15.99, 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. 15.82, 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.