Question : Find the curved surface area of a cone whose radius of the base is 7 cm and slant height is 8 cm. [Use $\pi=\frac{22}{7}$]
Option 1: 132 cm2
Option 2: 198 cm2
Option 3: 154 cm2
Option 4: 176 cm2
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Correct Answer: 176 cm2
Solution : According to the question radius = 7 cm and slant height = 8 cm Curved surface area of a cone = $\pi$ × radius × slant height = $\frac{22}{7}$ × 7 × 8 = 176 cm2 Hence, the correct answer is 176 cm2.
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Question : The curved surface area of a right circular cone is 44 cm². If the slant height of the cone is 7 cm, then find the radius of its base. [Use $\pi=\frac{22}{7}$ ]
Option 1: 2 cm
Option 2: 4 cm
Option 3: 3 cm
Option 4: 5 cm
Question : Find the curved surface area of a cone of radius 12 cm and slant height 14 cm. (Use $\pi$ = 3.14)
Option 1: 4325.5 cm2
Option 2: 527.52 cm2
Option 3: 5436.6 cm2
Option 4: 501.54 cm2
Question : What will be the curved surface area of a cone of radius 5 cm and a slant height of 30 cm? (Use $\pi=3.14$)
Option 1: 234 m2
Option 2: 715 m2
Option 3: 543 m2
Option 4: 471 cm2
Question : The curved surface area is thrice as big as the base area of a cone. If the diameter of the cone is 1 cm. Then what is the total surface area (in cm2) of the cone?
Option 1: $\pi$
Option 2: $3\pi $
Option 3: $2\pi$
Option 4: $4\pi $
Question : The slant height and the radius of a right circular cone are 11 cm and 6 cm, respectively. What is the curved surface area of the cone?
Option 1: $74 \pi\; {cm}^2$
Option 2: $60 \pi \;{cm}^2$
Option 3: $44 \pi\; {cm}^2$
Option 4: $66 \pi \;{cm}^2$
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