A cone has a base radius of 8cm and height 11cm. calculate , correct to 2d.p, the curved surface area
-
341.98cm\(^2\)
- 276.57cm\(^2\)
- 201.14cm\(^2\)
- 477.71cm\(^2\)
The correct answer is: A
Explanation
Where l\(^2\) = h\(^2\) + r\(^2\)
l\(^2\) = 11\(^2\) + 8\(^2\)
l = √185
l = 13.60cm
The formula of CSA of Cone is πrl
\(\frac{22}{7}\) * 8 * 13.60
= 341.979 or 341.98 (2d.p)