Polygons

[digital sand]

Regular means equiangular and equilateral

[long aurora]

regular means all sides have same length and all angles have same size
irregular means either not all sides have same length or not all angles have same size
A -> irregular
B -> irregular
C -> regular
D -> irregular
E -> neither

[summer orbit]

Thank you!

[heady matrix]

@kindred knot has given 1 rep to @long aurora