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volum tabung = phi . r^2 . t
= 2. phi . r^3
2 . phi . r^3 = 120
volum bola = 4/3 . phi . r^3
volum tabung diluar bola = (2- 4/3) . phi . r^3
= 2/3 . phi . r^3
= (2/3 . phi . r^3)/ (2 . phi . r^3) x 120
= 1/3 x 120
= 40
jawaban C
no 36)
phi . 21^2 . 80 / 2/3 . phi .6^3
= 35280 / 144
= 245
jawaban D