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p x l = Luas
(l +2) l = 168
l² + 2l - 168 = 0
( l - 12) (l + 14)
ambil Positif maka l= 12
P= 12+ 2 = 14
jadi panjng = 14cm lebar =12cm
p=2+l
L=pxl
168=(2+l).l
168=2l+
+2l-168=0
(l-12)(l+14)=0
l=12
p=14