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=luas kerucut-Luas alas
=1056-πr²
=1056-3,14×12×12
=1056-452,16
=603,84
Selimut=πrs
603,84=3,14×12×s
s=603,84/3,14×12
s=16
t=√16²-12²
=√112
t=4√7
volume
=⅓πrt
=3,14×12×4√7/3
=132,92cm³