The curved surface area of a right circular cone of slant height 10 cm and base radius 7 cm is
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Explanation:
The curved surface area (CSA) of a right circular cone is given by the formula:
CSA = πrl,
where:
– r is the radius of the base,
– l is the slant height of the cone.
From the problem:
– The radius (r) of the base is 7 cm,
– The slant height (l) is 10 cm.
Substitute the values of r = 7 cm and l = 10 cm into the formula:
CSA = πrl.
Using π ≈ 22/7 for calculation:
CSA = (22/7) × 7 × 10.
Simplify step by step:
CSA = 22 × 10,
CSA = 220 cm².
Thus, the curved surface area of the cone is 220 cm², which corresponds to option b) 220.
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