# Foundations of Geometry

## Typographical Errors in the Second Edition

• Page 14, line 16. Change "will used" to "will be used".

• Page 17, line 2. Delete the second "all".

• Page 65, line 7. Change "segments $$\overline{BC}$$" to "segment $$\overline{BC}$$".

• Page 76, line 12. Change "Corollary 5.7.3" to "Corollary 3.2.19". [Corrected in the third printing.]

• Page 76, line 18. Change "Theorem 5.7.10" to "Theorem 3.3.10". [Corrected in the third printing.]

• Page 76, line 29. Change "$$\mu(\angle HCB)=\mu(\angle HCB)$$" to "$$\mu(\angle HCB)=\mu(\angle HGB)$$"

• Pages 96 and 97, second half of the proof of Theorem 4.7.7. The proof assumes $$S$$ and $$T$$ are on the same side of $$\overleftrightarrow{PQ}$$. If not, use Theorem 4.2.6 to construct a triangle congruent to $$\triangle PQT$$ on the other side of $$\overleftrightarrow{PQ}$$ and use it instead.

• Page 114, line 1. Change "the the" to "the".

• Page 135, line 23. Change "$$\angle BAD \cong \angle CDA$$" to "$$\angle BCD \cong \angle CDA$$".

• Page 141, line 9. Change "$$K$$ in a half open interval" to "$$K$$ is a half open interval".

• Page 145, line 24. Change "point $$T$$ on $$\overrightarrow{AB}$$" to "point $$T$$ on $$\overrightarrow{AE}$$".

• Page 145, line 29. Change "the ray $$\overrightarrow{AT}$$" to "the ray $$\overrightarrow{PT}$$"

• Page 152, Definition 6.6.1. Change "if they contain asymptotically parallel rays" to "if they contain limiting parallel rays".

• Page 164, line 9. Change "equilateral decreases" to "equilateral triangle decreases".

• Page 170, two lines after Figure 7.6. Change "either use" to "use either".

• Page 173, Axiom 7.2.1. Change "$$\alpha(\square ABCD) = AB \cdot CD$$" to "$$\alpha(\square ABCD) = AB \cdot BC$$" [Corrected in the third printing.]

• Page 179, Exercise 1. Change "$$\alpha(\triangle ABC)=(1/2)\ AB \cdot BC$$" to "$$\alpha(\triangle ABC)=(1/2)\ AC \cdot BC$$" [Corrected in the third printing.]

• Page 191, line 1. Change "$$MP>(1/2)\ DF$$" to "$$AP>(1/2)\ DF$$"

• Page 361, line 2. Change "Hlibert's" to "Hilbert's".

• Page 361, line 6. Change "HIlbert" to "Hilbert".

• Page 375, hint for Exercise 7.2.1. Change "Theorem 7.1.7" to "Theorem 7.1.8".

• Page 376, hint for Exercise 8.2.1. Change "Exercise 7" to "Exercise 5.6.7". [Corrected in the third printing.]

• Page 376, hint for Exercise 8.3.5. Change "Exercise 3" to "Exercise 4.6.3". [Corrected in the third printing.]

• Page 377. Change "10.1.12" to "10.1.14".