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48=2p+2l
diket panjangnya lebih 12m dari lebarny
P=l+12
P-l=12
.
.
Sehingga,
2p+2l=48|×1 --> 2p+2l=48
P-l=12|×2 --> 2p+2l=24
(2p+2l=48)-(2p-2l=24)
(4l=24)
l=24/4
l=6