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p:l:t = 4x:3x:2x
a. V = 648
plt = 648
4x.3x.2x = 648
24x^3 = 648
x^3 = 648:24
x^3 = 27
x = akar pangkat tiga (27)
x = 3
p = 4x
p = 4.3
p = 12 cm
l = 3x
l = 3.3
l = 9 cm
t = 2x
t = 2.3
t = 6 cm
b. Lp = 2.(pl+pt+lt)
Lp = 2.(12.9+12.6+9.6)
Lp = 2.(108+72+54)
Lp = 2.234
Lp = 468 cm2
4x : 3x : 2x
volume : p.l.t
v : 4x.3x.2x
648 : 24x pangkat 3
x pangkat 3 : 648 / 24
x : akar pangkat 3 dari 27
x : 3
p: 4x : 4.3 : 12
l : 3x : 3.3 : 9
t : 2x : 2.3 : 6
luas permukaan : 2(pl) + 2(pt) + 2(lt)
lp : 2.12.9 + 2.12.6 + 2.9.6
lp : 216 + 144 + 108
lp : 468