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panjang = lebar + 5 cm
a. panjang = (x + 5) cm
b. keliling = 2(panjang x lebar)
= 2 (x + 5 + x)
= 2 (2x + 5)
= 4x + 10
luas = panjang x lebar
= (x + 5)(x)
= x² + 5x cm²