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r = 9cm
1/2 V bola = 1/2 x 4/3 x π x r³
= 1/2 x 4/3 x 3,14 x 9 x 9 x 9
= 1.526cm³
r = 1/2d = 1/2(18cm) = 9 cm
V = 4/3 (3,14)(9³)
V = 3.052,08 cm³
karena setengah bola maka 1/2(V) = 1/2(3.052,08) = 1.526,04 cm³