WAEC - Mathematics (2021 - No. 37)
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\(^2\)
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)
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