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p = 5 cm
t = 12 cm
Lp = 256 cm²
maka :
Lp = 2 x (pxl + pxt + lxt)
256 = 2 x (5xl + 5x12 + lx12)
256 = 2 x (5l + 60 + 12l)
256 = 2 x (17l + 60)
256 = 120 + 34l
34l = 256-120
l = 136/4
l = 4 cm
jadi lebar = 4 cm
256=2[5l+12l+60]
256=2[17l+60]
256=34l+120
256-120=34l
136=34l
l=136:34
l=4cm
jadi lebar balok 4cm.
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