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kubus B=12cm
jawab:
a. untuk kubus A 12.s = 12X15cm= 180 cm
untuk kubus B 12.s = 12X12cm= 144cm
b. luas= 6.s² = 6.15² =6.15.15 =1350
=6.12²=6.12.12=864
c.volume=s³ =15³=15.15.15=3375
=12³=12.12.12=1728
maaf kalo salah,,