SketchUp Polygon Tool: Polygon entities
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SketchUp's Polygon entities are similar to Faces entities, but can have 3 or more sides. These entities act as a single line in that they can define the edge of a face and also divide a face. Additionally, selecting one segment of the polygon selects the entire Polygon entity. However, all inference techniques will operate on the Polygon as though it were comprised of segments. Draw polygons with the Polygon tool.
Polygon entities are comprised of a radius and number of segments. The following image shows a six-sided polygon.