You would call the group of shapes which has at least one line of symmetry symmetrical shapes. Stars, circles, and rectangles are considered symmetrical shapes.
It all depends what types of shapes, but take for example a circle, it can have multiple lines of symmetry.
There are infinitely many such shapes. To start with, any regular will do.
None. A line of symmetry, if it exists, is infinitely long and so a third of the line cannot exist as a separate entity.
An order of symmetry is the number of times a line of symmetry can be drawn through a shape. For example, a square has four orders of symmetry: One up and down, one left and right, and two diagonal. A rectangle has an two orders of symmetry. A circle has an infinite number of orders of symmetry.
All regular shapes have a line of symmetry. But you can get rid of its line of symmetry by making it irregular (so the angles aren't the same).
Shapes do not always have lines of symmetry. For example, if you have an irregular shape, it will not have a line of symmetry. I am quite certain though that all geometric shapes have a line of symmetry.
No. Asymmetric shapes do not have any lines (or planes) of symmetry.
You would call the group of shapes which has at least one line of symmetry symmetrical shapes. Stars, circles, and rectangles are considered symmetrical shapes.
A nonrectangular parallelogram has rotational symmetry, but not line symmetry. Additionally, shapes such as the letters S, N, and Z can be rotated to show rotational symmetry, although they do not have line symmetry.
isoceles triangle
square
It all depends what types of shapes, but take for example a circle, it can have multiple lines of symmetry.
A square has four lines of symmetry.
There are infinitely many such shapes. To start with, any regular will do.
Triangle, square, circle.
Symmetry is the line in the middle of any object to split it into two equal parts. some objects or shapes don't always have a 'line' of symmetry.