A solid cylinder of radius 7cm is 10 cm long Fi... - WAEC Mathematics 2001 Question
A solid cylinder of radius 7cm is 10 cm long. Find its total surface area.
A
\(70\pi cm^2\)
B
\(189\pi cm^2\)
C
\(210\pi cm^2\)
D
\(238\pi cm^2\)
correct option: d
S = \(2\pi r^2 + 2\pi rh\)
= \(2\pi r(r + h)\)
= \(2\pi (7) (7 + 10)\)
= \(238\pi cm^2\)
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