An impact crater having a polygonal rim shape in plan view.
Polygonal impact crater, angular crater (rare)
A polygonal crater is an impact crater which in plan view is not circular, elliptical, or irregular, but more closely resembles a regular polygon with straight rim segments and clearly discernible angles between them. Typically only a part of the rim circumference is formed by straight segments. However, no rigorous definition of a polygonal crater exists.
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