Problem Statement
A right circular cone has radius 9 cm and height 12 cm. Find its slant height and curved (lateral) surface area.
Explanation
For a right cone, the slant height l is the hypotenuse of a right triangle formed by radius and height: l = √(r² + h²) = √(9² + 12²) = √(81 + 144) = √225 = 15 cm. The curved surface area (lateral area) is πrl = π×9×15 = 135π cm².
Code Solution
SolutionRead Only
l=√(r²+h²)=√(81+144)=15; CSA=πrl=π·9·15=135π
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