Math Open Reference
Math Open Reference: Incircle
A complete reference guide to incircles. It provides definitions and examples that enhance further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: The Incircle of a Triangle
Learn about the incircle of a triangle with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
CK-12 Foundation
Ck 12: Interactive Geometry: 4.5 Theorems About Concurrence in Triangles
Find out about some common centers of triangles.
PBS
Pbs: Russia's Conversion From Communism to Capitalism
A case that examines Russia's real-world struggles of converting from a command to market economy. Asks students to consider the pros and cons of both market systems and to formulate explanations for the large gap between the country's...
Other
Acn: Behavior Modification Charts for Home and School
A variety of charts to be used with children 10 and under from need Association for Comprehensive Neurotherapy. Acrobat Reader to be opened. You may customize each chart to fit your needs and there are several tips to assist in using...
Cut the Knot
Cut the Knot: Existence of the Orthocenter
This site defines the altitude of a triangle and gives the standard notation for altitudes of a triangle. The site then goes to list several proofs involving altitudes and orthocenters.
Math Words
Mathwords: Inscribed Circles
Mathwords provides an explanation and a diagram of an inscribed circle. By clicking on any of the highlighted words, you will learn about related terms.
Other
University of Evansville: Encyclopedia Triangle Centers
This site contains a comprehensive study of triangle centers. Seems more for an advanced level. Provides a list of six links to 1114 centers.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Triangle Centers: Etymologies
At this page you will find Dr. Math responding to an inquiry about the relevance of the names of each of the special triangle centers.
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