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il63 [147K]
3 years ago
5

Hello!

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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