Basic Expression Polygon (Square)--Mathematical Etudes

Created by David Landy (Oct 04, 2017).

This is the basic Expression Polygon, from the Mathematical Etudes project by Colin Foster (http://www.mathematicaletudes.com/). To solve it, fill in the equations below, and solve the equation generated by each line segment. Full instructions and materials at http://www.foster77.co.uk/Expression%20Polygons%20mt2015-08-62z1.doc