Example 5 - Chapter 11 Class 9 Surface Areas and Volumes

Last updated at April 16, 2024 by

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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

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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