Luas selimut kerucut 264cm2. Jika jari-jari alas kerucut 6 cm, hitunglah volume kerucut tersebut!
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Penyelesaian:
Ls=264cm²
r=6cm
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Ls=Ξ rs
264=3,14×6×s
264=22/7×6×s
264×7/22=6s
84=6s
s=14cm
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t²=s²-r²
t²=14²-6²
t²=196-36
t=√160
t=12,6cm
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V=⅓Ξ r²t
V=⅓×3,14×6×6×12,6
V=3,14×2×6×12,6
V=37,68×12,6
V=474,768cm³
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