Please help me prove one math task.

[tiigrike]

Need to prove that AB=ED.
(Maybe use similar triangles )
GF= diameter
AFEG=square
AB and AD are opposite sides of the projecton

(don't look , how i mark angels)

 

[Deleted member 4993]

No.... I am going out to play Cricket now..... refused to get involved with "spinning-head" problem....