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maka
240 = 2(p+l)
1/2 × 240 = 1/2 × 2 (p+l)
120 = p+l
panjang : lebar
7 : 5
p+l = 120
lebar maka
5/(7+5) x 120 = 5/12 x 120 = 5 x 10 = 50 cm