The length, breadth and height of a cuboid (rectangular solid) are 4 : 3 : 2.

(i) If its surface area is 2548 cm², find its volume.

(ii) If its volume is 3000 m³, find its surface area.

The curved surface area of a cylinder, with length 10 cm and radius 7 cm, is :

1. 22 cm²

2. 308 cm²

3. 44 cm²

4. 440 cm²

The radius and the length of a cylindrical rod are 5 cm and 10 cm respectively. Its lateral surface area is :

1. 10 cm²

2. 50 cm²

3. 75 cm²

4. none of these

The formula for the volume of the cylindrical pipe is :

1. π(R + r) h

2. π(R — r)h

3. π(R² + r²) h

4. π(R² - r²) h