# Geometry - Third Edition

## Chapter 6: Polygons and Quadrilaterals

Some links are repeated for use with more than one lesson.

http://www.math.com/tables/geometry/polygons.htm
This site defines polygons, lists their names, and gives their formulas.

### 6.2 Angles of Polygons

http://www.algebralab.org/lessons/lesson.aspx?file=Geometry_AnglesSumPolygons.xml

http://www.regentsprep.org/regents/math/geometry/GG3/indexGG3.htm
NEW This page has lessons and practice problems on the sums of interior and exterior angles of polygons.

http://www.explorelearning.com/index.cfm?method=cResource.dspResourcesForCourse&CourseID=258
This site contains gizmos to explain quadrilaterals and other polygons.

http://www.math.com/school/subject3/lessons/S3U2L3GL.html
This site defines quadrilaterals and lists the five most common types.

### 6.4 Properties of Parallelograms

http://www.coolmath.com/reference/parallelograms.html

### 6.5 Special Parallelograms

http://www.freemathhelp.com/feliz-special-parallelograms.html