After viewing a link, close the browser window to return to this page.
Some links are repeated for use with more than one lesson.

9.1  Equations of Circles

http://home.alltel.net/okrebs/page61.html
This page explains finding the equation of a circle and shows examples.

http://www.mathwarehouse.com/geometry/circle/equation-of-a-circle.php
This site explains equations for circles and has an online quiz about equations of circles.

9.2  Tangents

http://www.mathopenref.com/tangent.html
This page explains tangents and has a virtual circle to experiment with tangents. This website requires Java to run some of its features.

http://www.mathwarehouse.com/geometry/circle/tangent-to-circle.php
This page defines tangents and has an online quiz with about tangents.

9.3  Chords and Arcs

http://www.freemathhelp.com/Lessons/Geometry_Arcs_and_Chords_BB.htm
This site contains a video tutorial with notes on arcs and chords.

http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=175
This page contains a gizmo explaining arcs and chords.

9.4  Inscribed Angles

http://www.pinkmonkey.com/studyguides/subjects/geometry/chap7/g0707401.asp
This site defines inscribed angles and proves its theorem.

http://www.ronblond.com/M11/INSC.INSC.APPLET/
This site shows the graph of inscribed angles.

9.5  Angles Formed by Tangents and Secants

http://www.algebralab.org/lessons/lesson.aspx?file=Geometry_CircleSecantTangent.xml
This site includes explanations, diagrams, and practice related to tangents and secants.

9.6  Loci

http://library.thinkquest.org/16284/g_circle_5.htm#Loci
This page briefly discusses the properties of loci.