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678,24=3,14×9(s+9)
678,24=254,34×s
s=678,24/254,34
s=2,6cm
t²=s²-r²
=2,6²-9²
=6,76-81
t=√74,24=8,6cm
V. kerucut=1/3Πr²t
=1/3×3,14×9²×8,6
=729,108cm³