Quick geometry question involving some angles... and a circle... and some stuff along some lines...?

Question

http://www.flickr.com/photos/28874431@N08/2753542953/

AB is a diameter

1. Angle 6 =

2. Arc CD =

3. Angle 7 =

4. Angle 8 =

Any help would be appreciated, but all 4 would be Best answer to the first!

Answer 1

It's been a while since geometry...

I know that Arc CD is 64 (180 - (60 + 54))

I think that angle 6 is 30 degrees, that angle 7 is 60 degrees, and angle 8 is 17 degrees.