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Luas kubus = 420
6s² = 420
s² = 70
s = √70
panjang rusuk = diagonal bola
d bola = s = √70
r bola = 1/2 √70
luas bola = 4 π r² = 4 (22/7)(1/2)²)(√70)²
Luas Bola = 4 (22/7)(1/4)(70)
L = 220 cm²