There is an infinite number of lines across a circle that form two symmetric half-circles.
They have infinite lines of symmetry.
If you are talking about a perfect circle, it has wan infinite number if lines of symmetry. If you are talking about and actual lower case o, then the answer is two.
A nephroid has 2 lines of symmetry.
it has five lines of symmetry
10 lines of symmetry
4 Lines of symmetry
2 lines OF SYMMETRY
2 lines of symmetry
It has 2 lines of symmetry.
no lines of symmetry
2 lines of symmetry
5 lines