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300π cm³ = 1/3 x Luas alas x 36 cm
Luas alas = 25π cm²
πr² = 25π cm²
r = 5 cm
luas.alas=fi r^2
terlebih dahulu cari vol.
300=1/3 fi r^2 36
fi r^2 = 300/36.1/3
fi r^2 = 300/12
r^2=25/fi
r=..pakai kalkulator ya