Here is a link to an excellent post regarding exterior angles of polygons.
https://www.mathsisfun.com/geometry/exterior-angles-polygons.html
ORB Set For New Expedition to Sedona
The Oddity Research Brigade is set for a new expedition to Sedona in the near future. As usual, the brigade will be seeking further evidence of Sasquatch. Brigade members should bring the usual equipment though experimental tools are highly encouraged – particularly those demonstrated in the most recent advanced research and technology demonstration.
Excelsior!
Here is a link to some helpful Triangle Centers
https://www.mathsisfun.com/geometry/triangle-centers.html
I think that this site covers centers we are mostly interested in(high school geometry).
Test post for math.
test.