WAEC - Mathematics (1998 - No. 53)
Find the curved surface area of a cone of radius 3cm and slant height 7cm (\(take \pi = \frac{22}{7}\)
\(22cm^2\)
\(44cm^2\)
\(66cm^2\)
\(132cm^2\)
\(198cm^2\)
説明
Curved surface area of a cone \(= \pi rt\\
\frac{22}{7}\times 3\times 7 = 66cm^2\)
\frac{22}{7}\times 3\times 7 = 66cm^2\)