» Areas, Volumes, Surface Areas - Use these simple illustrated formulas to calculate volume and surface area of various shapes.
» Brain Teasers: Geometry Puzzles - Slice and complete various figures to form requested shapes.
» Cynthia Lanius' Lessons: Geometry Online - Have fun learning through activities about polygons, triangles, circles, and the volume of cylinders. Page includes an historic timeline, SAT type quiz, and glossary of terms.
» Figures and Polygons - Shows different types of straight-sided shapes with up to ten sides. Gives the total number of degrees for each side.
» Fugues of the Well-Tempered Clavier - Interactive Director movie comparing a fugue by Johann Sebastian Bach to a Möbius strip.
» Geometria - A program for computing lines, surfaces and volumes of the main plane and solid figures, through direct and indirect formulas. Includes multiple languages.
» Geometry - Explains and describes geometric terms, measurement of angles, types of figures, coordinate graphs, areas and volumes.
» Geometry from the Land of the Incas - Presents problems involving circles and triangles, with proofs, SAT practice quizzes and famous quotes. Also, has examples of geometry in Peruvian culture.
» Introduction to the Works of Euclid - Covers the life of Euclid and a discussion of Euclidean geometry.
» Mad Maths - Contains proposed mathematical theorems in a fun way.
» Point Out the View - Use visualization to determine how four different people see a set of 3-D blocks. From PBS Kids.
» Spaceship Builder - Use a virtual geoboard to help Dr. Marbles design a new fleet of cyberspace ships. From PBS Kids.
» Spaghetti and Meatballs For All - Webquest for 3rd-8th graders comparing the perimeter and area of rectangles. Relates to the book "Spaghetti and Meatballs For All!" by Marilyn Burns.
» Tangrams - Choose a puzzle, then click and drag virtual tangram pieces to solve it. From PBS.
» Teen Math Whizzes Go Euclid One Better - Features a discussion about the works of two teenagers, David Goldenheim and Daniel Litchfieldm, from Connecticut. They helped find a solution that eluded Euclid in finding a method to partition a line into any number of equal sections.
» The Everlasting Pi - The history, uses,and creator of pi and also some fun facts, jokes and songs.
» The Pythagorean Theorem Lesson - A lesson on the pythagorean theorem with the objective that the you will discover for yourself the actual theorem.
» Tim's Triangular Page - Learn about the basic properties, formulas, theorems and different types of triangles. Includes proofs and illustrations.
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