polygon support in grapher

[Evangelospro]

When working with geometry problems you are very often required to visualize a shape created by some random points only connected by straight lines (polygon).
It would be nice if the option to insert a polygon was supported by numworks. I would imagine something like the below:

In addition, in order to find the area of the polygon formed, a formula such as the shoelace method can be utilised and the expected interface would be something similar to the output of an integral like below: