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= 4/3 . 3,14 . (20)^3
= 4/3 . 3,14 . 8000
= 4,1867 . 8000
= 33493,6 cm^3
luas permukaan = 4pi r^2
= 4 . 3,14 20 . 20
= 5024 cm^2
mohon maaf kalau hitung2annya salah