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Example 8 - Chapter 13 Class 9 Surface Areas and Volumes (Term 2)
Last updated at Aug. 26, 2021 by Teachoo
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Surface Area and Volume Formulas Important
Chapter 13 Class 9 Surface Areas and Volumes
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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
