Premium Online Home Tutors

3 Tutor System

Starting just at 265/hour

Answer :

Given :

Height (h) cylindrical pillar = 3.5 m

Radius (r) of the circular end of pillar = \(\frac{50}{2}\) cm = 25 cm = 0.25m

Now, we know that,

CSA of cylindrical pillar = \(2{\pi}rh\)

= \(2 × \frac{22}{7} × 0.25 × 3.5\) \({m}^2\)

= \(44 × 0.125\) \({m}^2\)

= 5.5 \({m}^2\)

Now, Cost of painting 1 \({m}^2\) area = Rs. 12.50

Cost of painting 5.5 \({m}^2\) area = Rs. (5.5 x 12.50) = Rs. 68.75

Therefore, the cost of painting the CSA of the pillar is Rs. 68.75

- 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.
- 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?
- A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm. Find itsi) inner curved surface areaii) outer curved surface areaiii) total surface area.
- 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 \({m}^2\).
- 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.
- The inner diameter of a circular well is 3.5 m. It is 10 m deep. Findi) its inner curved surface areaii) the cost of plastering this curved surface at the rate of Rs. 40 per \({m}^2\).
- 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.
- 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 \(\frac{1}{12} \) th of the steel actually used was wasted in making the tank.
- In figure below, 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.
- 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?

- NCERT solutions for class 9 maths chapter 1 Number Systems
- NCERT solutions for class 9 maths chapter 2 Polynomials
- NCERT solutions for class 9 maths chapter 3 Coordinate geometry
- NCERT solutions for class 9 maths chapter 4 Linear equations in two variables
- NCERT solutions for class 9 maths chapter 5 Introduction to Euclidean Geometry
- NCERT solutions for class 9 maths chapter 6 Lines and Angles
- NCERT solutions for class 9 maths chapter 7 Triangles
- NCERT solutions for class 9 maths chapter 8 Quadrilaterals
- NCERT solutions for class 9 maths chapter 9 Areas of parallelograms and triangles
- NCERT solutions for class 9 maths chapter 10 Circles
- NCERT solutions for class 9 maths chapter 11 Constructions
- NCERT solutions for class 9 maths chapter 12 Heron's Formula
- NCERT solutions for class 9 maths chapter 13 Surface areas and volumes
- NCERT solutions for class 9 maths chapter 14 Statistics
- NCERT solutions for class 9 maths chapter 15 Probability

- NCERT solutions for class 9 science chapter 1 Matter in our Surroundings
- NCERT solutions for class 9 science chapter 2 Is Matter Around Us Pure
- NCERT solutions for class 9 science chapter 3 Atoms and Molecules
- NCERT solutions for class 9 science chapter 4 Structure of the Atom
- NCERT solutions for class 9 science chapter 5 The Fundamental Unit of Life
- NCERT solutions for class 9 science chapter 6 Tissues and Fundamental unit of life
- NCERT solutions for class 9 science chapter 7 Diversity in Living Organisms
- NCERT solutions for class 9 science chapter 8 Motion
- NCERT solutions for class 9 science chapter 9 Force and Laws of Motion
- NCERT solutions for class 9 science chapter 10 Gravitation
- NCERT solutions for class 9 science chapter 11 Work and Energy
- NCERT solutions for class 9 science chapter 12 sound
- NCERT solutions for class 9 science chapter 13 Why do We Fall Ill
- NCERT solutions for class 9 science chapter 14 Natural Resources
- NCERT solutions for class 9 science chapter 15 Improvement in Food Resources