Solutions for Serge Lang's "Geometry (2nd edition)"

Chapter 1 Distance and Angles

Sec.1 Lines

Sec.2 Distance

Sec.3 Angles

Sec.4 Proofs

Sec.5 Right Angles and Perpendicularity

Sec.6 The Angles of a Triangle

ex.1     ex.2     ex.3     ex.4     ex.5

ex.6     ex.7     ex.8     ex.9     ex.10

ex.11     ex.12     ex.13     ex.14     ex.15

ex.16     ex.17     ex.18     ex.19     ex.20

ex.21     ex.22     ex.23

Sec.7 An Application: Angles of Reflection

No exercise.

Additional Exercises for Chapter 1

ex.1     ex.2     ex.3     ex.4     ex.5

ex.6     ex.7     ex.8     ex.9

Chapter 2 Coordinates

Sec.1 Coordinate Systems

Sec.2 Distance Between Points on a Line

Sec.3 Equation of a Line

Chapter 3 Area and the Pythagoras Theorem

Sec.1 The Area of a Triangle

ex.1     ex.2     ex.3     ex.4     ex.5

ex.6     ex.7     ex.8     ex.9     ex.10

ex.11     ex.12     ex.13     ex.14     ex.15

ex.16     ex.17     ex.18     ex.19     ex.20

ex.21     ex.22

Sec.2 The Pythagoras Theorem