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panjang = 120 m
lebar = 90 m
penyelesaian :
K = 2 x (p+l)
= 2 x (120+90)
= 2 x 210
= 420 m
Jadi perbandingan Panjang : Keliling = 120 : 420 ...dibagi 60
2 : 7
keliling persegi panjang: 2x(p+l)
2 x (120+90)
420
perbandingan= 2:7