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panjang = 9
masukin nilainya ke rumus :
keliling = 2 (panjang + lebar)
28 = 2 (9 + lebar)
14 = 9 + lebar
14 - 9 = lebar
5 = lebar
masukkan nilai ke rumus luas
Luas = panjang × lebar
= 9 × 5
= 45
jadi, luas persegi panjang tersebut adalah 45 cm²