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l = (5√3 - 3) cm
L = pl
= (6 + 2√3)(5√3 - 3)
= 30√3 - 18 + 10(3) - 6√3
= 30√3 - 18 + 30 - 6√3
= 12 + 24√3
= 12(1 + 2√3) cm²....(D)