Hi inkscapers

not sure if this is a beginners question but i still concider myself as a beginner!

i'm trying to make a path for text to follow and I want it to be around a perfect circle arc. now when i'm trying to draw a circle it is only doing paths not a full full circle?

so 2 questions :
1.how do I fix circle tool problem ?
2. how can I draw a perfect arc path for text to follow?

thanks
Shane 
 

The ellipse tool controls bar above the top ruler, has a button on the far-right end to restore to a complete ellipse. The rx and ry numeric controls can make a true circle.

The circle can be used for a text guide path, or the stop/start handles can be used if an arc is desired.

ican't seem to change it?

I'd use the red button on the end, then make rx = ry.