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80 = 2 (5x + 3x)
40 = 8x
X = 5
Panjang = 5 x 5 = 25
80 = 2(p+l)
p+l = 40
jumlah perbandingan 5+3 = 8
maka panjangnya adalah
5/8 x 40 = 25 cm