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s=pelukisnya
r=jarijari
t=tinggi
^=pangkat
t^2=s^2-r^2
t^2=15^2-12^2
t^2=225-144
t^2=81
t=akar dari 81
t=9
(2) Cari volume
V=1/3.phi.r^2.t
V=1/3.3,14.225.9
V=3,14.675
V=2.119,5 Cm^3