jari-jari suatu kerucut 12 cm Dan garis pelukisnya 15 cm. hitunglah volume kerucut...?

r = 12
s = 15
t kuadrat = s kuadrat - r kuadrat
t kuadrat = 15x15 - 12x12
t kuadrat = 225 - 144
= 81
t = √81
= 9
v = 1/3 x phi x r x r x t
= 1/3 x 3,14 x 12 x 12 x 9
= 3,14 x 12 x 12 x 3
= 3,14 x 144 x 3
= 3,14 x 432
= 1356,48 cm kubik