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jika, ukuran lebar persegi= 8 cm
panjang sisi persegi= 12 cm
luas persegi= s × s
= 12 × 12
= 144
maka, panjang persegi :
144 : 8= 18 cm
keliling persegi= 4 × s
= 4 × 12
= 48 cm
keliling persegi panjang :
2(p + l)
2(18 + 8)
2(26)
52
perbandingan keliling persegi panjang : persegi= 52 : 48= 13 : 12 (d).