Rotational symmetry
Example
This shape is an equilateral triangle. It can rotate into its outline in 3 ways. It has rotational symmetry of order 3.
This shape is a parallelogram. It can rotate into its outline in 2 ways. It has rotational symmetry of order 2
Question
Copy this triangle onto squared paper. Construct a shape by adding more triangles so that the new shape has rotational symmetry of order 4 about the point 0.
