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maaf kalau salah..
5. r = ½×28 = 14 cm
t = 30 cm
v.kerucut = ⅓ ×phi×r²×t
= ⅓ ×22/7×14×14×30
= 6160 cm³.
maaf saya cman bsa jawab no.5
sekali lagi maaf kalau salah.