Home
Class 9
MATHS
In Fig. 13.12, you see the frame of a la...

In Fig. 13.12, 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 cmis to be given for folding it over the top and bottom of the frame. Find how much cloth is required for covering the lampshade

Text Solution

Verified by Experts

Diameter of the base of lampshade, d = `20` cm
radius r = `d/2`= `20/2`cm
height = `30` cm
Margin over the top and bottom = `2.5 cm + 2.5 cm = 5cm`
Hence total length of the cloth usedh = 30 cm + 5 cm
h = 35 cm
The cloth required for covering the lampshade = `2pirh` =`2*3.14*10*35=2200cm^2`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • SURFACE AREAS AND VOLUMES

    NCERT|Exercise EXERCISE 13.8|10 Videos

  • SURFACE AREAS AND VOLUMES

    NCERT|Exercise EXERCISE 13.1|8 Videos

  • STATISTICS

    NCERT|Exercise EXERCISE 14.1|2 Videos

  • TRIANGLES

    NCERT|Exercise EXERCISE 7.2|8 Videos

Similar Questions

Explore conceptually related problems

A heap of rice is in the form of a cone of base diameter 24 m and height 3.5 m. How much canvas cloth is required to just cover the heap?

A heap of rice is in the form of a cone of diameter 9 m and height 3.5 m. Find the volume of rice. How much canvas cloth is required to just cover the heap?

A heap of rice is in the form of a cone of of base diameter 24m and height 3.5m. Find the volume of the rice.How much canvas cloth is required to just cover the heap

A heap of wheat is in the form of a cone of diameter 9m and height 3.5m. Find its volume. How much canvas cloth is required to just cover the heap? (U se pi=3.14)

A room has length 4m, breadth 3m and height 3m. How much paper of width 25cm will be required to cover the four walls of the room

A frustum of a right circular cone has a diameter of base 20 cm, of top 12 cm, and height 3 cm. Find the area of its whole surface and volume.

A frustum of a right circular cone has a diameter of base and top 20 cm and 12 cm, respectively and a height of 10 cm. Find the area of its whole surface and volume.

A company packages its milk powder in cylindrical container whose base has a diameter of 14 cm and height 20 cm. Company places a label around the surface of the container (as shown in figure). If the label is placed 2 cm from top and bottom, what is the area of the label?

Vedika has 23.5 metres of cloth. She used it to make 5 curtains of equal size. If each curtain required 4 metres 25 cm of cloth to make, how much cloth still remains with her ?

The decorative block is made of two solids a cube and a hemisphere.The base of the block is a cube with edge 5cm, and the hemisphere fixed on the top has a diameter of 4.2cm. Find the total surface area of the block.

Home
Profile