Geometry - Third Edition
Chapter 4: Similar Triangles
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This site applies to the entire chapter.
http://www.freemathhelp.com/Lessons/Geometry_Similar_Triangles_BB.htm
This site contains a video tutorial with notes on similar triangles.
4.1 Ratio and Proportion
http://www.mathleague.com/index.php?option=com_content&view=article&id=80&Itemid=67
NEW This site defines ratio,
proportion, and rate, and has examples of each.
http://www.math.com/school/subject1/lessons/S1U2L2GL.html
This page takes an in-depth look at proportion.
4.2 Similarity
http://www.cut-the-knot.org/ctk/Similarity.shtml
This site has an article called “A Case of Similarity” that proves the similarity of triangle theorems.
4.3 Proportions in Similar Triangles
http://www.regentsprep.org/regents/math/geometry/GP11/indexGP11.htm
NEW This page contains links
to several pages that explain and provide practice for using proportions to
prove triangles are similar.
4.4 Indirect Measurement
http://mathforum.org/sanders/connectinggeometry/ch_09Similar.html
NEW This page includes an explanation
of how you can use indirect measurements with similar triangles to measure
distant objects.
4.5 Proportions in Right Triangles
https://www.opened.io/?res_id=72581#!/resources/364561
NEW This short video lecture
demonstrates using similar right triangles to measure the height of objects.
http://www.regentsprep.org/Regents/math/geometry/GP12/indexGP12.htm
NEW This page includes an explanation
and practice for using proportions in right triangles to solve problems.
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