Area of a rhombus is 90 cm². If the length of one diagonal is 10 cm then the length of other diagonal is

1. 18 cm

2. 9 cm

3. 36 cm

4. 4.5 cm

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

The adjoining figure shows a rectangle and a semicircle. The perimeter of the shaded region is

1. 70 cm

2. 56 cm

3. 78 cm

4. 46 cm

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

1. 140 cm²

2. 77 cm²

3. 294 cm²

4. 217 cm²