Re: robot don't spin correctly

dear thank you for your anwers 
I've read the tutorial ,i have execute his project 
in her example she said to turn the robot use set speed(0,angular speed) 

my question please 
i've set my angular 2pi in second and my robot is circle  
why the robot don't return in the original pose?
I'm student in computer science
Please explain me I want to learn
Thank you 



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