A square, circles, triangle, diamond, O or a M. Symmetry is when you put a line down the middle of a shape or letter and on both sides they are exactly the same. Hope that helps.
A circle
parallel
they can but not all shirts have a line of symmetry for example an assymetrical shirt doesnt have a line of symmetry
An isosceles triangle for example has only one line of symmetry
A rhombus (not square) for example.
A kite, for example.
It has 1 line of symmetry
A house has 1 line of symmetry.
It has 1 vertical line of symmetry
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.
A line has only 1 line of symmetry that i know of.
A cardioid has 1 line of symmetry.
The line of reflection in symmetry is the imaginary line that travels down the line of symmetry. For example, in a square, the line of reflection would be the line down the center of the square, and the line down the diagonal of the square.
It has 1 line of symmetry.