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Lesson Plan
EngageNY

Special Lines in Triangles (part 2)

For Teachers 9th - 10th Standards
Medians, midsegments, altitudes, oh my! Pupils study the properties of the median of a triangle, initially examining a proof utilizing midsegments to determine the length ratio of a median. They then use the information to find missing...
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Website
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Centroid: Center of Gravity

For Students 9th - 10th
At this site you will find am online discussion about the centroid of a triangle. The page begins with a discussion of observations leading to the centroid of a triangle. Dr. Math explains the correct findings as well as the errors made...
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Handout
Wolfram Research

Wolfram Math World: Triangle Centroid

For Students 9th - 10th
This site from MathWorld gives a diagram of a triangle with its centroid labeled. The site details how to find the centroid with links to the key terms. The site details many other interesting properties of the triangle centroid.
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Activity
Other

University of Evansville: Centroid

For Students 9th - 10th
This site from the University of Evansville contains information on the centroid. The information is brief and two picture images are given as well.