Young children can be given symmetrical shapes (e.g., isosceles triangles and trapezoids, rectangles, rhombuses) to put them together and see whether the combination of two (or more) symmetrical ...

A 2D shape is symmetrical if you can draw a line through it and it looks exactly the same either side. This line is called a line of symmetry. Oh that rather smug expression tells me that square ...

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 ...