duesanerexaphobia
Duesanerexaphobia is the fear of 2 sided shapes such as crescents and semi-circles.
Fear of 2 sided shapes(cresents and semi-circles)
dwaniphobia
Dwaniphobia is the fear of irregular nonagons, which are shapes with nine sides that are not of equal length.
Fear of irregular nonagons (a shape that has 9 sides but the side aren't in equal length)
trianglephobia
Fear of triangles, often accompanied by anxiety or panic when exposed to triangle shapes.
Fear of triangles