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96 = 2(p+l)
(p+l) = 96÷2 = 48
Anggap 48 itu jmlhnya
Jmlah perbandingan = 7+5= 12
panjang= 7/12 ÷ 48 = 28cm
lebar = 5/12 ÷ 48 = 20 cm
Luas = pl
=28 . 20
= 560 cm2