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s = 84/12
s = 7 cm
Jumlah rusuk kubus = 12
Jumlah panjang rusuk kubus = 84 cm
Ditan :
Panjang rusuk ............ ?
Jawab :
= Jumlah panjang rusuk kubus : Jumlah rusuk kubus
= 84 : 12
= 7 cm