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r= ½d= ½.47= 23½cm
V½bola = ½. 4/3 x π x r³
= ⅔ × 3,14 × (23½)³
= ⅔ × 3,14 × 12977,875
= ⅔ × 40750527,5
= 27167018,3 cm³
Luas permukaan ½bola = ½× 4 x π x r²
= 2 × 3,14 × 23,5 × 23,5
= 3468,13 cm²