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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 ().
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