polygons

In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.

在该地区发现大量小型冻胀丘、石环等冰缘现的存在。

A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.

四个相等的平行四；不是直角的等平行四。