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Immigrant oabcd

∵ Quadrilateral ABCD is a parallelogram, point O is the diagonal intersection of parallelogram ABCD, the circumference of OE⊥AC, △CDE = 12 ㎝.

∴AB=CD AD=BC=AE+ED AO=OC AE=EC

∴EC+CD+ED= 12=CD+ED+AE

The ∴ perimeter of parallelogram ABCD = AB+BC+CD+AD = 2 (AE+ED+CD) = 2×12 = 24 ().