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r = 21 :2 = 10,5
volume bola : 4/3 πr³
: 4/3 . 3.14. 10,5³
: 4846,59 cm³
v bola = ( 4/3 ) .3,14 .r3
v = 1,333 x 3,14 x 10,5 pangkat 3
v = 1,333 x 3,14 x 1157,625
v = 4,18562 x 1157,625
v = 4845,3783 cm3
v kubus = 21 x 21 x 21
v = 9261 cm3