In the adjoining figure, OACB is a quadrant of a circle of radius 7 cm. The perimeter of the quadrant is

1. 11 cm

2. 18 cm

3. 25 cm

4. 36 cm

In the adjoining figure, OABC is a square of side 7 cm. OAC is a quadrant of a circle with O as center. The area of the shaded region is

1. 10.5 cm²

2. 38.5 cm²

3. 49 cm²

4. 11.5 cm²

The area of the shaded region shown in the below figure is

1. 140 cm²

2. 77 cm²

3. 294 cm²

4. 217 cm²

In the adjoining figure, the boundary of the shaded region consists of semicircular arcs. The area of the shaded region is equal to

1. 616 cm²

2. 385 cm²

3. 231 cm²

4. 308 cm²