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2014-07-25T00:34:48+05:30

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ABCDE be a regular pentagon.  AE be base. C be the top vertex from which a perpendicular is drawn to AE meeting AE at F.  So AFC and CFE are right angle triangles.  AC and EC are same as it is a regular pentagon. In these two triangles two sides are equal AC = EC and CE =CE. Angle CFA and CFE = 90.  So they rare congruent. AF = EF.
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