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t² = 20²+12²
t² = 400-144
t = √256
t = 16
volum 1/2 bola
volume = 1/2 x 4/3 x phi x r³
= 1/2 x 4/3 x 3,14 x 12 x 12 x 12
= 2/3 x 5425,29
= 10851,84 / 3
= 3617,28
volume krucut
volume = 1/3 x π x r² x t
volume = 1/3 x 3,14 x 12 x 12 x 16
= 3,14 x 4 x 12 x 16
= 3,14 x 768
= 2411,52
maka volum seluruhnya
3617,28 + 2411,52 = 6028,8 cm³
= 60,288 kg