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A right angled sector of radius r cm is rolled up into a cone in such a way that the two binding radii are joined together. Then the curved surface area of the cone is
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- πr² cm²
- 4πr² cm²
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πr² cm² 4 - 2πr² cm²
- πr² cm²
Correct Option: C
| Radius of the base (r1) = | |
| 4 |
Slant height = r
| ∴ Curved surface area = πr1l = | cm² | |
| 4 |
