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d1 : r=t = 21 cm
volume 1/2 bola - volume kerucut
1/2 x 4/3 x 22/7 x r x r x r - 1/3 x 22/7 x r x r x t
(1/2 x 4/3 - 1/3 ) x ( 22/7 x r x r x r )
1/3 x 22/7 x 21 x 21 x 21
9702 cm^3