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Mathematics

1 answer:

max2010maxim [7]3 years ago

6 0

Let O be the point of intersection of diagonals.

Consider triangles FOE and EOD:
FO = OD, ∠FOE = ∠EOD and OE is a common side ⇒
triangles FOE and EOD are congruent.

In congruent triangles all corresponding sides and are congruent ⇒
EF = DE = 6

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