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Piyush365
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Asked: 2026-10-05T09:31:40+00:00 In:

Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m.

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Given slant height is 21 m and diameter 24 m, the radius is 12 m. The total surface area formula πr(l + r) gives (22/7) × 12 × 33 = 1244.57 m².

CBSE Class 9 Ganita Manjari part 2 Chapter 14 Solutions
Class 9 Ganita Manjari Part 2 Math of Space Surface Area and Volume Question Answer

chapter 14 math of space surface area and volume solutionsdownload class 9 maths ganita manjari part 2 book and solutionsif its slant height is 21 m and diameter of its base is 24 mncert solutions – ganita manjari part ii math of space surface area and volumetotal surface area of a cone
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    1. Given the diameter is 24 m, the base radius r = 12 m and slant height l = 21 m. The formula for total surface area of a cone is TSA = πr(l + r). Substituting the given values with π ≈ 22/7, we get TSA = (22/7) × 12 × (21 + 12) = (22/7) × 12 × 33 = 8712/7 ≈ 1244.57 m².

       

      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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