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K = 60 cm
p : l = 7 : 5
Maka,
K = 2(p + l)
60 = 2(p + l)
30 = p + l
Sehingga,
p = 7/12 x 30
= 17,5 cm
Jadi, panjangnya adalah 17,5 cm
2(7n+5n) = 60
2(12n) = 60
24n = 60
n = 2,5
Panjangnya = 7(2,5) = 17,5 cm
Lebarnya = 5(2,5) = 12,5 cm