Jawabanmu

2014-05-07T12:16:36+07:00
Kubus= persegi 
30 kali 30 = 900 cm
2014-05-07T12:16:47+07:00
R = 30 cm
luas triplek yg dibutuhkan = s x s x 6
= 30 x 30 x 6
= 900 x 6
= 5.400 cm²