Example 5 - Chapter 11 Class 9 Surface Areas and Volumes
Last updated at Dec. 13, 2024 by Teachoo
Last updated at Dec. 13, 2024 by Teachoo
Example 5 Find (i) the curved surface area and (ii) the total surface area of a hemisphere of radius 21 cm. Given r = 21 cm Curved Surface Area of hemisphere = 2πr2 = 2 × (22)/7 × 21 × 21 cm2 = 2 × 22 × 3 × 21 cm2 = 2772 cm2 Total Surface Area of hemisphere = 3πr2 = 3 ×( 22)/7 × 21 × 21 cm2 = 3 × 22 × 3 × 21 cm2 = 4158 cm2
Examples
Example 2
Example 3 Important
Example 4
Example 5 Important You are here
Example 6
Example 7
Example 8
Example 9 Important
Example 10
Example 11 Important
Example 12
Surface Area and Volume Formulas Important
Question 1
Question 2 Important
Question 3
Question 4 Important
Question 5
Question 6
Question 7 Important
About the Author
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 and Computer Science at Teachoo