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Ayushree
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Asked: 2026-10-06T04:25:53+00:00 In:

Find (i) the curved surface area and (ii) the total surface area of a hemisphere of radius 21 cm.

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For radius 21 cm: (i) Curved surface area is 2πr² = 2 × (22/7) × 21² = 2772 cm². (ii) Total surface area is 3πr² = 3 × (22/7) × 21² = 4158 cm².

Class 9 Ganita Manjari part 2 Chapter 14.4 Solutions
Class 9 Ganita Manjari Part II Chapter 14 Page 140 Question Answer

curved surface areaganita manjari part 2 chapter 14 math of space surface area and volume solutionsganita manjari part 2 chapter 14 question answermath of space surface area and volume solutions – ganita manjari part ii chapter 14total surface area of a hemisphere of radius 21 cm
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    1. Given the radius of the hemisphere r = 21 cm. (i) The curved surface area of a hemisphere is given by CSA = 2πr². Using π = 22/7, CSA = 2 × (22/7) × 21 × 21 = 2 × 22 × 3 × 21 = 2772 cm². (ii) The total surface area includes the curved surface and circular base: TSA = 3πr² = 3 × (22/7) × 21 × 21 = 4158 cm².

       

      For more NCERT Solutions of Class 9 Maths Ganita Manjari Part 2 Chapter 14 Math of Space: Surface Area and Volume Question Answer (2026-27)

      https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-14/

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