The alternate segment theorem

this is a well above the standed question for a yr 10 geometry assignment i am working on

http://i286.photobucket.com/albums/l...1/untitled.jpg

so the first thing i did was to draw a diameter from a to a new point g, which the i joined two lines from g to d and e, the next thing i did was to find 3 right angles in the circle so i could try to find a relationship between g,d,a and a,e,d

http://i286.photobucket.com/albums/l.../untitled2.jpg

but now i am kinda stuck

any help would be greatly appreciated

thanks

Zac