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Jari- jari = 35 cm
Luas permukaan 1/2 bola
= 1/2 × 4 × 35 × 35
= 2 × 35 × 35 = 2.450 m^2
Biaya pembuatan
= 2.450 × Rp 25.000,-
= Rp 61.250.000,-