Hello 

I need some help please.

 I'm trying to draw a circle with a flat but can work out out to do it? I have my circle and i now need to add my 'flat' i have my line but cannot 'join' the two and get rid of the bit of circle thats left behind. 

I have attached a picture of what i'm trying to achieve. 

I'm new to draft sight, be gentle!

Thomas