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144 = 2 . (p+l)
(p+l) = 144÷2 = 72
Maka jumlah perbandingan = 7+5 = 12
jadi
panjang = 7/12 x 72 = 42
lebar = 5/12 x 72 = 30
luas = p . l
luas = 42 . 30
luas = 1.260 cm2