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r= 18/2=9
t=12cm
Vol kerucut= 1/3(phi)rxrxt
= 1/3 x3.14x9.9x12cm
=1/3x254,34x12
=1017,36cm3
kalo dicarinya pake phi
maka nyarinya= 1/3xrxrxt
=1/3x9x9x12=324 Phi
soalnya kan yang ditanyainnya belakangnya pake phi kan? bukan cm?kalo cm diatas udh ada