what is zero angle ?can you give an example.

its nothing just starting point to make an angle. for eg if you want to make 125 degree you start from 0* 

i think we should ask to experts.

 it came  on starting point from were an angle is start

a zero angle is an angle wich mesurs 0 digree example when the clocks bigger arm is on 9 and smaller arm on 3

It is the starting point of an angle.

the starting point of an angle..........

there is nat any zero angle

I think Zero anle is an angle with no vertex. It is like a ray.:-)