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r² = 150 : 6
r² = 25
r = √25
r = 5 m
Jumlah panjang rusuk kubus = 12 × 5 = 60 m
s^2 = 150 : 6
s^2 = 25
s = 5
jumlah seluruh rusuk = 5 x 12
= 60 m