**NCERT Solutions For Class 9, Maths, Chapter 13, Surface Area And Volume, Exercise 13.2** consists of total 11 questions to discuss. Here, these questions are well explained .

Table of Contents

Toggle## Class 9, Maths, Chapter 13, Exercise 13.2, Solutions

**Q.1. The curved surface area of a right circular cylinder of height 14 cm is 88 cm ^{2}. Find the diameter of the base of the cylinder.**

**Ans:**

**Q.2. It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square metres of the sheet are required for the same?**

**Ans:**

**Q.3. A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm in the given figure. Find its**

**(i) inner curved surface area,**

**(ii) outer curved surface area,**

**(iii) total surface area.**

**Ans:**

**Q.4. The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m ^{2}.**

**Ans:**

**Q.5. A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of ₹12.50 per m ^{2}.**

**Ans:**

**Q.6. Curved surface area of a right circular cylinder is 4.4 m ^{2}. If the radius of the base of the cylinder is 0.7 m, find its height.**

**Ans:**

**Q.7. The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find**

**(i) its inner curved surface area,**

**(ii) the cost of plastering this curved surface at the rate of ` 40 per m ^{2}.**

**Ans:**

**Q.8. In a hot water heating system, there is a cylindrical pipe of length 28 m and diameter 5 cm. Find the total radiating surface in the system.**

**Ans:**

**Q.9. Find : (i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high.**

**(ii) how much steel was actually used, if ** ** of the steel actually used was wasted in making the tank.**

**Ans:**

**Q.10. In given the figure, you see the frame of a lampshade. It is to be covered with a decorative cloth. The frame has a base diameter of 20 cm and height of 30 cm. A margin of 2.5 cm is to be given for folding it over the top and bottom of the frame. Find how much cloth is required for covering the lampshade.**

** **

**Ans:**

**Q.11. The students of a Vidyalaya were asked to participate in a competition for making and decorating penholders in the shape of a cylinder with a base, using cardboard. Each penholder was to be of radius 3 cm and height 10.5 cm. The Vidyalaya was to supply the competitors with cardboard. If there were 35 competitors, how much cardboard was required to be bought for the competition?**

**Ans:**

## NCERT Solutions For Class 9 Maths Chapter 13, Surface Area And Volume (All Exercises)

**Class 9, Maths, Chapter 13, Exercise 13.1****Class 9, Maths, Chapter 13, Exercise 13.2****Class 9, Maths, Chapter 13, Exercise 13.3****Class 9, Maths, Chapter 13, Exercise 13.4****Class 9, Maths, Chapter 13, Exercise 13.5****Class 9, Maths, Chapter 13, Exercise 13.6****Class 9, Maths, Chapter 13, Exercise 13.7****Class 9, Maths, Chapter 13, Exercise 13.8**