Yes, for example, an equilateral triangle.
A triangle has 3 lines of symmetry.
3
Eqiilateral trangle i
No, a polygon can have fewer 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)
The number of lines of symmetry in a regular polygon is equal to the number of its sides. Each line of symmetry can be drawn through a vertex and the midpoint of the opposite side or through the midpoints of two opposite sides. Therefore, a regular polygon with ( n ) sides will have ( n ) lines of symmetry. For example, a regular triangle has 3 sides and 3 lines of symmetry, while a regular pentagon has 5 sides and 5 lines of symmetry.
an irregular polygon
It depends on how many sides that it has and whether of not it is regular (all the lines of the polygon are of equal length if it is a regular polygon). For regular polygons, the number of symmetry lines is the number of sides if number of sides is an odd number. Otherwise, the number of symmetry lines is double the number of sides. A square has 4 sides and 8 symmetry lines; a triangle has 3 sides and 3 symmetry lines.
I think that it can have 0, 1, 2, 3, 6, 9 or 18 lines of symmetry.
Number of lines of symmetry = Number of sides of the regular polygon
10 lines. Regular polygon of "x" sides has "x" Lines of Symmetry
a polygon