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t =28cm
volume=1056cm³
phi=22/7
Ditanya=Diameter...?
Jawab =
Volume = ⅓.πr².t
1056=⅓.22/7.r².28
1056=88/3.r²
r²=3/88.1056
r²=36
r=√36
r=6
Jadi diameter kerucut tsb adalah 6×2=12cm.