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l.alas= 525
p.l=525
7.3=525
21=525
1=525:3
1=175
p= 7.175 =1225
l=3.175=525
t=5.175=875
v= p.l.t
= 1225.525.875=562.734.375
l= lebar
t=tinggi
p=pnjang
L=2.(pxt)+ 2.(pxl) + 2.(lxt)
116 = 2(px6) + 2.(px8) + 2(8x6)
116 = 12p + 16p+ 96
28p= 116-96
p = 20/28
V=volume=pxtxl
= 8x6x20/28
= 34,28cm^3
40. s= pnjang rusuk
jmlh pnjang rusuk = 12 x s
108 = 12 s
s = 108/12= 9
V= volume = s^3= s x s x s
= 9x9x9 = 729cm^3