Natale Zappia develops nz_Edge2Polygon, the newest sketchup extension that is available in extension warehouse. It generates polygons by maintaining perfect reference edge lengths.
This extension is compatible with SketchUp 2016, SketchUp 2017, SketchUp 2018. The plugin is ideal for enhancing your drawing and productivity.
nz_PolyhedralJuctions also comprises of nz_Edge2Length and also provides more complicated operations. Here n denotes nth number or sides.
To download the extension, go through the extension warehouse extensions.sketchup.com