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180 = 36 a
180 : 36 = a
5 = a
V = 4(5) x 3(5) x 2(5)
= 20 x 15 x 10
= 3000 cm kubik
maka perbandingan p:l:t = 4x:3x:2x
Panjang kerangka = 4 (p+l+t) = 180
4 (4x+3x+2x) = 180
4.9x = 180
36x = 180
x = 180/36
x = 5
Volume balok = p.l.t = 4x.3x.2x = 4.5 x 3.5 x 2.5 = 20x15x10 = 3000 cm²