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Ex 13.3, 3 - Curved surface area of a cone is 308 cm2 - Area Of Cone

  1. Chapter 13 Class 9th Surface Areas and Volumes
  2. Serial order wise
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Ex 13.3, 3 Curved surface area of a cone is 308 cm2Β and its slant height is 14 cm. Find radius of the base and [π΄π‘ π‘ π‘’π‘šπ‘’ πœ‹=22/7] It is given that Curved Surface Area of cone =308 Ο€rl = 308 22/7Γ—π‘ŸΓ—14= 308 22Γ—π‘ŸΓ—2= 308 r = (308/(2 Γ— 22)) cm ∴ r = 7 cm Therefore, the radius of the circular end of the cone is 7 cm. Ex 13.3, 3 Curved surface area of a cone is 308 cm2Β and its slant height is 14 cm. Find (ii) total surface area of the cone. [π΄π‘ π‘ π‘’π‘šπ‘’ πœ‹=22/7] We know that l = 14 cm, r = 7 cm Total surface area of cone = Ο€r(lΒ + r) = 22/7Γ— 7Γ— (14 + 7) = 22/7Γ— 7 Γ— 21 = 22 Γ— 1 Γ— 21 = 462 cm2 Therefore, the total surface area of the cone is 462 cm2.

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