plane figure
geometric shape in two-dimensional space
lune
shape
circular segment
slice of a circle cut perpendicular to the radius
curve of constant width
convex planar shape whose width is the same regardless of the orientation of the curve
circular sector
portion of a disk enclosed by two radii and an arc
lens
2D shape
disk
plane figure, bounded by circle
polygon
plane figure bounded by line segments
Koch snowflake
fractal and mathematical curve