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t = 12 cm
π = 3, 14
ditanya : Vkerucut....?
jawab : --> K = 2πr
31,4 = 2 x 3,14 x r
31,4 = 6,28 x r
r = 31,4 / 6,28 = 5 cm
maka volume kerucut = 1/3πr²t
= 1/3 x 3,14 x 5² x 12
= 3,14 x 25 x4 = 314cm³
periksa lagi ya,