Activity
Other

Quantum Object: A 3 D Mobius Strip

For Students 9th - 10th
Highly technical site on the Mobius Strip.
Handout
Math Open Reference

Math Open Reference: Biography of Euclid

For Students 9th - 10th
Biography of Euclid, a Greek Mathematician, also known as the 'Father of Geometry'.
Activity
Math Open Reference

Math Open Reference: Constructions

For Students 9th - 10th Standards
Learn about drawing shapes using only a compass and straight edge or ruler with out measuring any lengths or angles.
Lesson Plan
Alabama Learning Exchange

Alex: Platonic Solids Ornaments

For Teachers 9th - 10th
This is a hands-on activity that introduces students to the five Platonic solids. Students will discover the special relationship between faces, vertices, and edges. Students will research the Platonic solids and then construct and...
Unit Plan
Boston University

Fractal Geometry of the Mandelbrot Set Ii

For Students 9th - 10th
This web site addresses counting and adding in fractal operations, as well as the role of the Fibonacci sequence in fractal geometry.
Handout
Wikimedia

Wikipedia: Hyperbolic Geometry

For Students 9th - 10th
This encyclopedia entry from Wikipedia offers a discussion on hyperbolic geometry. The site explains how the hyperbolic geometry plane is represented in two dimensions and how lines in the plane must be drawn. Other types of models for...
Handout
Jim Loy

Jimloy.com: Saccheri

For Students 9th - 10th Standards
This site explains the Saccheri quadrilateral and the importance of his work in geometry.
Activity
Other

Georgia Tech: The Four Color Theorem

For Students 9th - 10th
An explanation and proof of the Four Color Map Theorem. Includes illustrative images and a plethora of information.
Handout
World History Encyclopedia

World History Encyclopedia: Greek Mathematics

For Students 9th - 10th
Discusses the major cultural influences on the development of mathematics in ancient Greece, and how the Greeks went on to surpass those cultures. The work of the Pythagoreans and of Euclid are described, along with some famous...
Website
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Hyperbolic Geometry

For Students 9th - 10th Standards
Dr. Math, responds to a question fro a nineth grade stduent who wants to understand hyperbolic geometry. The Dr. uses descriptive analogies in attempts to unravel why triangles in hyperbolic geometry have less than 180 degrees in them.
Handout
Oswego City School District

Regents Exam Prep Center: Theorems and Postulates for Geometry

For Students 9th - 10th Standards
Here is a partial list of theorems, postulates, and properties.
Interactive
Other

Greatest Common Factor Calculator

For Students 9th - 10th Standards
Free online calculator provides help with finding the greatest common factor.
Handout
University of St. Andrews (UK)

University of St. Andrews: St. Andrews: History of the Four Color Theorem

For Students 9th - 10th
The University of St. Andrews offers a brief history of the first math problem to be solved with computers.
Professional Doc
Louisiana Department of Education

Louisiana Doe: Louisiana Believes: Eureka Math Parent Guide: The Concept of Congruence

For Students 8th
A guide to support parents as they work with their students in the concept of congruence.
Handout
Other

Stat Soft: Statistics Glossary

For Students 9th - 10th
Dozens of statistical terms are defined and illustrated in this glossary.
Unit Plan
University of California

University of California: Geometry in Action

For Students 9th - 10th Standards
This page collects various areas in which ideas from discrete and computational geometry (meaning mainly low-dimensional Euclidean geometry) meet some real-world applications.
Handout
Wolfram Research

Wolfram Math World: Parallel Lines

For Students 9th - 10th Standards
A definition for parallel lines in two-dimensional and three-dimensional Euclidean space. The site also gives reference to skew lines and explains the difference between skew and parallel lines in three-dimensional space.
Handout
Dartmouth College

Dartmouth College: The Different Styles of Euclid and Copernicus

For Students 9th - 10th Standards
A history of the differences between Euclid's and Copernicus's methods of proving geometric ideas.
Activity
University of Canterbury

Canterbury: The Konigsberg Bridge Problem

For Students 9th - 10th
An introduction to the Konigsberg Bridge problem and its relationship to network theory.
Handout
Wolfram Research

Wolfram Math World: Spherical Geometry

For Students 9th - 10th Standards
Site provides a brief explanation of the discipline of Spherical Geometry along with many links to spherical geometry topics.
Unit Plan
Boston University

Boston University: Chaos, Fractals and Arcadia

For Students 9th - 10th
This is an interesting site for information on chaos and fractals. Includes links to interactive activities to learn more.
Unit Plan
Boston University

Bu: Fractal Geometry of the Mandelbrot Set

For Students 9th - 10th
This site progresses in iterations through Mandelbrot and Julia sets to explain fractals and the mathematics behind them.
Handout
Wolfram Research

Wolfram Math World: Euclid's Algorithm

For Students 9th - 10th
This site from Mathworld.com provides a very detailed description of Euclid's algorithm of common divisors and a method of finding the greatest.
Lesson Plan
Shodor Education Foundation

Shodor Interactivate: Lesson: Fractals

For Teachers 9th - 10th
This site provides some links to activities and lesson plans dealing with fractals and chaos.

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