ABSTRACT
Overview. An answer key for all Challenge Questions is provided on the ESA website. Some of the web answers amplify or provide geometric backup to the answers provided here. Most Challenge Questions are posed in three locations: Section 2.7 (for Polygons and Stars), Chapter 14 (for Part II), and Chapter 20 (for Part III), but a few are also posed elsewhere. In each case, the answers provided here note the appropriate section rather than page reference.
