coincides with C. If after this rotation"
The following are all the errata that I know of. The changes are indicated in red. If you see other errata please send me a message at dwh2@cornell.edu. Note that some of the errata (as noted below) have been corrected in the 2nd and later printings.
These errata were updated on 22 Feb 1999
Pg x, line 20: "Projections of a Sphere onto a Plane" (corrected in 2nd printing)
Pg xvi, line 19: "continued with Eduarda, Justin, Kelly, Beth, and Hal during 1992-93."
Pg xvi, line 12-: "Lénárt, Julie Lubell, ..."
Pg xxi, line 16: "... This active participation is vital for"
Pg xxi, line 20: "This is particularly true for teachers or prospective teachers who are"
Pg 10, Figure 1.13: All the five short links should be of the same length.
Pg 19, Figure 2.5: "Central symmetry." (corrected in 2nd printing)
Pg 30, line 7-: "A 90° cone is also easy to make"
Pg 30, line 7-, thru pg 31, line 6: remove underlines from all occurrences of "°".
Pg 31, Figure 4.2: "A cone with variable cone angle (0 - 360°)." (corrected in 2nd printing)
Pg 32, Figure 4.4: "Variable cone angle larger than 360°)." (corrected in 2nd printing)
Pg 39, line 15: "per and the cone are locally isometric except at the cone point. The"
Pg 39, line 18: "depict a 1-sheeted covering of a 270° cone and label two points and their"
Pg 39, Figure 4.13: "1-sheeted covering of a 270° cone."
Pg 41, Figure 4.2: The point labeled "1" should be on the angle bisectors in which they lie instead of being the segment bisectors (corrected in 2nd printing)
Pg 49, line 8-: The change is in the fourth prime: " coincides with C. If after this rotation"
Pg 61, Figure 6.3: On the third triangle from the top the angle should be "a1". (corrected in the 2nd printing)
Pg 74, Figure 7.9: Remove the label "equator". (corrected in the 2nd printing)
Pg 107, Figure 12.3: "Equivalent by subtraction."
Pg 111, line 5: "shown in Problem 10 that two ..." (corrected in the 2nd printing)
Pg 111, line 10-: "lems 10 and 11.]" (corrected in the 2nd printing)
Pg 111, line 2-: The two captial H's should be in the Palace Script font.
Pg 123, Figure 13.11: "By #11, the polygon can be dissected into triangles." (corrected in the 2nd printing)
Pg 136, Figure 14.10: The top-most horizontal line should be lowered so that it passes thru the intersection of the vertical axis and the largest circle.
Pg 155, header: "Properties on the Projective Plane -- Problem 50 "
Pg 174, line 10: "and that we see all parts of this ball with equal tolerance. (That is, we ignore"
Pg 174, line 15: "guishable (in the field of view) if their distance apart is less that t "
Pg 174, line 17-: "A differentiable curve is a geometric object which, for any tolerance, if "
Pg 178, line 10-11: "Thomas, Ivor, trans., Selections Illustrating the History of Greek Mathematics, Cambridge, MA: Harvard University Press, 1951.
Pg 180, line 8: "A history and description of various ways that people have consid-"