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k=L+L+L+9+L+9=42
24=4L
L=6 m
2(p +l) = 42 m
p+l = 42 : 2
p+l = 21
cari dua bilangan ditambahkan jadi 21, di kurangkan jadi 9
angka tersebut yaitu 6 dan 15.
Jadi, panjangnya 15 m. lebarnya 6 m