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81π=π×r²
r²=81π
r=√81
r=9cm
Ls=π×r×s
369π=π×9×s
369π=9πt
s=369/9
s=41cm
t=√s²-r²
=√41²-9²
=√1681-81
=√1600
t=40
jadi tingginya 40 cm