Question on: WAEC Mathematics - 1991
A cylinder of base radius 4cm is open at one end . If the ratio of the area of its base to that of its curved surface is 1:4, calculate the height of the cylinder
A
1cm
B
2cm
C
4cm
D
8cm
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Correct Option: D
r= 4cm; base area = (\pi)r2; Curve S.A = 2(\pi)rh
(\frac{base area}{curved area}) = 1/4; (\pi)/2(\pi)rh
=h = (\frac{4 x 4cm}{2})
h= 8cm
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