Question 10 - Area Of Cylinder - Chapter 11 Class 9 Surface Areas and Volumes

Last updated at April 16, 2024 by

Ex 13.2, 10 - In figure, you see the frame of a lampshade - Area Of Cylinder

Ex 13.2, 10 - Chapter 13 Class 9 Surface Areas and Volumes - Part 2

Transcript

Question 10 In the given 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. [ = 22/7] Cloth is in the form of a cylinder Height = 30 + 2.5 + 2.5 cm = 35 cm Radius = 20/2 = 10 cm Area of cloth required = Curved Surface Area of cylinder = 2 rh = (2 22/7 10 35) cm2 = (2 22 10 5) cm2 = 2200 cm2 Hence, for covering the lampshade, 2200 cm2 cloth will be required.

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.