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.

Triangle

This shape is a parallelogram. It can rotate into its outline in 2 ways. It has rotational symmetry of order 2

Parallelogram

Question
Rotational symmetry triangle completion on gridlines

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.

Rotational symmetry triangle on gridlines