# GeoGebra

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Wiki Reference Wiki — a wiki containing examples of how to make the wiki do stuff. wiki wiki wiki. I like saying wiki. wiki. I have a question! Some people (a whole 2 of them!) have asked about what new things I have been working on. Is there any actual interest in me setting up some sort of notification system? It would probably be using twitter because that is quick and easy. 3D Shapes . Intro We live in a three-dimensional world. Every object you can see or touch has three dimensions that can be measured: length, width, and height. The room you are sitting in can be described by these three dimensions. Math Planet - Expressions and variables An algebraic expression comprises both numbers and variables together with at least one arithmetic operation. Example: A variable, as we learned in pre-algebra, is a letter that represents unspecified numbers. One may use a variable in the same manner as all other numerals: To evaluate an algebraic expression you have to substitute each variable with a number and perform the operations included.

The Museum of Unworkable Devices The Reading Room. Related Galleries. Web resources. Deceptions by Peter Parsons. We don't talk much about deliberate contemporary scams and deceptions on these pages. We don't have to, for this excellent site debunks them thoroughly. Geometry Geometry is all about shapes and their properties. If you like playing with objects, or like drawing, then geometry is for you! Geometry can be divided into: Point, Line, Plane and Solid A Point has no dimensions, only position A Line is one-dimensional A Plane is two dimensional (2D) A Solid is three-dimensional (3D) Plane Geometry

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