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Areas, Volumes, Surface Areas [ Teens ] - Use these simple illustrated formulas to calculate volume and surface area of various shapes.
Brain Teasers: Geometry Puzzles [ Teens/Mature Teens ] - Slice and complete various figures to form requested shapes.
Cynthia Lanius' Lessons: Geometry Online [ Teens/Mature Teens ] - 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.
The Everlasting Pi [ Teens/Mature Teens ] - The history, uses,and creator of pi and also some fun facts, jokes and songs.
Figures and Polygons [ Kids/Teens/Mature Teens ] - 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 [ Kids/Teens/Mature Teens ] - Interactive Director movie comparing a fugue by Johann Sebastian Bach to a Möbius strip.
Geometria [ Teens/Mature Teens ] - A program for computing lines, surfaces and volumes of the main plane and solid figures, through direct and indirect formulas. Includes multiple languages.
Geometry [ Kids/Teens ] - Explains and describes geometric terms, measurement of angles, types of figures, coordinate graphs, areas and volumes.
Geometry [ Teens ] - Games, illustrations, and definitions.
Geometry from the Land of the Incas [ Teens/Mature Teens ] - 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 [ Teens/Mature Teens ] - Covers the life of Euclid and a discussion of Euclidean geometry.
Mad Maths [ Mature Teens ] - Contains proposed mathematical theorems in a fun way.
Point Out the View [ Kids/Teens ] - Use visualization to determine how four different people see a set of 3-D blocks. From PBS Kids.
The Pythagorean Theorem Lesson [ Teens ] - A lesson on the pythagorean theorem with the objective that the you will discover for yourself the actual theorem.
Spaceship Builder [ Kids ] - Use a virtual geoboard to help Dr. Marbles design a new fleet of cyberspace ships. From PBS Kids.
Spaghetti and Meatballs For All [ Kids ] - 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 [ Kids/Teens ] - Choose a puzzle, then click and drag virtual tangram pieces to solve it. From PBS.
Teen Math Whizzes Go Euclid One Better [ Mature Teens ] - 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.
Tim's Triangular Page [ Teens/Mature Teens ] - Learn about the basic properties, formulas, theorems and different types of triangles. Includes proofs and illustrations.