Polygon 2D shapes are the most convenient way to create regular polygons. You can choose between the most used ones, like triangle, pentagon, hexagon or define them by its sides later in the process.
How to use it
To use the Polygon tool, enter Sketch, select the Polygon tool and start dragging it. The point where you start will be the center point.
You can select between the type of polygons by tapping on the tool's icon again.
Define the number of sides and the radius
After you have created the polygon, you will be able to define the sides and the radius of the polygon. Tap on labels and define them.
Please note, that after deselection the polygon will behave as a set of constrained lines, not as it's own entity. You won't be able to easily change its radius and number of sides