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Luas bola = 4.π.r²
400 = 4.π.r²
π.r² = 100
Luas seluruh tabung = 2.π.r² + 2.π.r.t
= 2.π.r² + 2.π.r(2r)
= 2.π.r² + 4.π.r²
= 6π.r²
= 6.100
= 600 cm² (D)