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

Radius of the base of a solid cylinder is 1 cm and its length is 7 cm. Its volume is :

1. 11 cm³

2. 22 cm³

3. 33 cm³

4. 44 cm³

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

A rectangular piece of paper 10 cm by 8 cm is rolled along its width to get the cylinder of largest size. The curved surface area of the cylinder formed is :

1. 44 cm²

2. 20 cm²

3. 80 cm²

4. 80 cm²