Figure 2.

Representation of SE/CE polygons. (a) A polygon can be constructed with CEs and with SEs. (b) Area and length components can be obtained separately for the CEs and SEs. Note that ${\displaystyle \pm \delta a^{\left(\mathrm{C}\mathrm{E}\right)}}$ represents relative area differences as compared with SE polygons. Signs indicate whether the area was subtracted from, or added to, the area of the SE polygon.