A 2D shape is symmetrical if a line can be drawn through it so that either side of the line looks exactly the same. The line is called a line of symmetry. This is sometimes called a 'mirror line ...

Symmetry is when one side of a shape is a mirror image of the other side. Lots of buildings and everyday objects use symmetry because it looks appealing to the human eye. Watch the video below ...

However, I can offer a relatively simple way to draw such a shape using a straight edge and compass. Take an equilateral triangle and extend its sides out across the page. Now, draw an arc centred ...