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1/2 Vk = 1/2 1/3 πr²t ---> t = 2/3. 30
= 20 cm
1/2 Vk = 1/6. π.12². 20
= 1/6 π. 144. 20
= 480π
= 480 x 3,14
= 1507,20 cm³
V = 1/3 . 3,14. 12^2 .2/3 t
V = 1/3 . 3,14 . 144 . 2/3 . 30
V = 3,14 . 144 . 2/3 . 10
V = 3104,4 cm³
karena 1/2 kerucut, maka
V = 3104,4 /2 = 1507,2 cm³
jawabannya D