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The central angle of a sector is 120°. What is the ratio of radius and slant height of a circular cone made by it? What is the radius and slant height of a cone if its curved surface area is 108 π cm2. |
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Answer» The ratio of radius and slant height = \(\frac{120}{360}=\frac{1}{3}\) = 1 : 3 curved surface area (πrl) = 108π rl = 108; r × 3 r = 108 3 × r2 = 108; r2 = 36 radius (r) = 6 cm; slant height (l) = 3r = 3 × 6 = 18cm |
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