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keliling = 40m
2p + 2l = 40m
p + l = 20m
p : l = 5 : 3
panjang = 5/(5+3) x 20m
= 5/8 x 20m
= 12,5 m
lebar = 20m - 12,5m
= 7,5 m
buatlah gambar sesuai ukuran panjang dan lebar tersebut
perbandingan panjang dan lebar = 5:3
jumlah perbandingan >>> 5 + 3 = 8
panjang = 5 x 40 = 25 : 2 = 12,5
8
lebar = 3 x 40 = 15 : 2 = 7,5
8
panjang = 12,5 m
lebar = 7,5 m
bukti....
keliling = (2 x panjang) + (2 x lebar)
= (2 x 12,5) + (2 x 7,5)
= 25 + 15
= 40 m
semoga membantu :)