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Lebar : Panjang = 35 : x
35/7 x 9 = 5 x 9 = 45
lebar = 35 panjang = 45
kell = 2(p+l)
= 2(45+35)
= 2(80)
= 160 cm
K = 2 ( 45 cm + 35 cm )
K = 2 × 80 cm
K = 160 cm