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v=1/3 x phi x r x r x t
=1/3 x 3,14 x 5 x 5 x 12
=314
= √(s²-t²)
= √(13²-12²)
= √(169-144)
= √25
= 5 cm
maka,
V kerucut
= 1/3 x phi x r² x t
= 1/3 x 3,14 x 5² x 12
= 4 x 3,14 x 25
= 314 cm^3