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Lp = 2(La) + kliling x t
= 2 ( d1 x d2 : 2) + ( 4 x s x 15)
= 2 ( 18 x 24 : 2 ) + (4 x 15 x 15 )
= 2 (216 ) + 900
= 432 + 900
= 1332 cm²