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Perbandingan p : l = 3 : 2
jumlahnya adalah 5.
K = 2 x ( p + l)
100 = 2 x (p +l)
100/2 = p+l
50 = p + l
p=3/5 × 50
= 30
l = 2/5× 50
=20
Jadi, panjangnya 30 cm dan lebarnya
20 cm.
30 x 20 = 600 cm2
Perbandingan = 3:2
Luas Persegi = Panjang x Lebar
P = 120
L = 80
P x L= 9600