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100 = 2(p+l)
(p+l) = 100÷2= 50 cm
Jumlah perbandingan = 3 +2 = 5
Panjang = 3/5 x 50 = 30 cm
Lebar = 2/5 x 50 = 20 cm
Luas = p x l
luas = 30 X 20
Luas = 600 cm2
l = 2x
K = 2(p + l)
100 = 2(3x + 2x)
50 = 5x
x = 10
p = 30 cm
l = 20 cm
Luas = 30 cm x 20 cm = 600 cm²