Only the ones that are squares have.
Squares, which are parallelograms, have four lines of symmetry. Rectangles have only two. Rhombi have two lines of symmetry. Generic parallelograms don't have any lines of symmetry.None normally unless it is in the shape of a rectangle in which case it will have 2 lines of symmetry
2 lines of symmetry
A nephroid has 2 lines of symmetry.
it has five lines of symmetry
Equilateral Triangles (3 lines of symmetry)Rectangles (at least 2 lines of symmetry)Squares (4 lines of symmetry)Rhombuses (at least 2 lines of symmetry)Any regular polygon (at least 5 lines of symmetry)
it has no lines of symmetry
A parallelagram can be a square, which has four lines of symmetry or a rectangle which has two lines of symmetry but the generic parallelagram has zero lines of symmetry
There is no such thing as 8 lines of symmetry. A circle, for example, has infinitely many lines of symmetry.
5 lines
A decagon need not have any lines of symmetry. It can also have 1 or 10 lines of symmetry.
Lines of symmetry are 2 dimensional. Planes of symmetry are 3D.
10 lines of symmetry