1. Chapter 13 Class 9 Surface Areas and Volumes
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Example 8 - Chapter 13 Class 9 Surface Areas and Volumes

Last updated at July 11, 2018 by

Example 8 - Find (i) the curved surface area and (ii) the - Examples

  1. Chapter 13 Class 9 Surface Areas and Volumes
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    3. Examples

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Transcript

Example 8 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

Chapter 13 Class 9 Surface Areas and Volumes
Serial order wise

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.