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p = 6/11 x 66 cm =36 cm
catatan : 11 didapat dari perbandingan panjang dan lebar yang dijumlahkan
Perbandingan P : L = 6 : 5
K = 66 cm
faktor pengali = y
maka :
K = 2 x (p+l)
66 = 2 x (6y+5y)
66 = 2 x 11y
y = 66/22
y = 3 cm
jadi :
panjang = 6 x 3 = 18 cm
lebar = 5 x 3 = 15 cm