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l = (4 + x) cm
K = 2 (p + l) cm
= 2 ( 2x + 4 + 4 + x ) cm
= 2 (3x + 8) cm
= 6x + 16 cm
L = p × l
= (2x + 4)(4 + x)
= 8x + 2x² + 16 + 4x
= 2x² + 12x + 16 cm²