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=4(19+10+6)
=4. 35
= 140cm=1,4m
8,5m - 1,4m= 7,1m sisa kwt
2. k=12 . s
= 12 .8,75
= 105 cm = 1,05 m
6,3 m : 1,05 = 6 kerangkai kubus
3. 25akar 2= akar 25 = 5
L = 6p^2
= 6. 5^2
= 6. 25
= 150 cm^3