Let AB be a diameter in a given circle and let C be a point on the circle such that OC $\perp$ AB. Let D be an arbitrary point on the small arc AC. Let E be the point of intersection between OC and BD. Let F be the point of intersection of the tangent lines drawn at A and D
OBEF is a parallelogram
OEDF is a cyclic trapezoid
What I have so far...
to prove OBEF is a parallelogram I have to show wither opposite sides parallel or opposite sides congruent. I am stuck on how to chase the angles
Any help would be appreciated!