# Geometry - Third Edition

## Chapter 1: Discovering Geometry

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### 1.1 Basic Geometric Figures

http://www.mathleague.com/index.php?option=com_content&view=article&id=75&Itemid=67
This site lists the basic geometric figures, defines them, and shows examples.

http://www.wisc-online.com/objects/index_tj.asp?objID=ABM301
This site explains the basic 2D figures and has a matching game at the end of the presentation.

### 1.2 Measuring Line Segments

http://www.freemathhelp.com/length-line-segment.html
This page explains how to find the length of a line segment by explaining examples.

### 1.3 Angles

http://www.mathleague.com/index.php?option=com_content&view=article&id=74&Itemid=67
This page explains angles and basic angle terms and includes pictures.

### 1.4 Constructions

http://www.cut-the-knot.org/do_you_know/compass.shtml
This site has instructions for constructions using only a compass.

http://www.regentsprep.org/regents/math/geometry/GC1/indexGC1.htm
This site contains lessons on basic constructions with practice problems.

### 1.5 Perpendicular and Parallel Lines

http://www.terragon.com/tkobrien/algebra/topics/perpendicularlines/perpendicularlines.html
This page contains notes on perpendicular lines and has a coordinate grid to display the lines.

http://www.mathsisfun.com/geometry/parallel-perpendicular-lines-planes.html
This page contains nicely illustrated definitions of perpendicular and parallel lines.