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 TOPICS This page:   two-dimensional  geometry    Search   Dr. Math See also the Dr. Math FAQ:   geometric formulas and   naming polygons   and polyhedra Internet Library:   Euclidean/plane   geometry ELEMENTARY Arithmetic    addition    subtraction    multiplication    division    fractions/decimals Definitions Geometry    2-dimensional      circles      triangles/polygons    3D and higher      polyhedra Golden Ratio/ Fibonacci Sequence History/Biography Measurement    calendars/      dates/time    temperature    terms/units Number Sense/ About Numbers    infinity    large numbers    place value    prime numbers    square roots Projects Puzzles Word Problems Browse Elementary Two-Dimensional Geometry Stars indicate particularly interesting answers or good places to begin browsing. Selected answers to common questions:     What are length and width? Rectangles and Areas [09/30/1998] How do you find the area of a square or rectangle? What if the shape looks like several rectangles put together? Short History of Geometry [09/15/2001] Were there any people who helped to develop geometry besides Euclid? Six Lines Make Twelve Triangles [11/06/2002] How can I use 6 lines to make 12 triangles? Three Cuts and Seven Pieces [01/18/1999] Is there any way that you can cut a pie into seven pieces with just three straight cuts? Using a Protractor [8/15/1996] How do I measure angles using a protractor? Vertical Angle [11/15/2001] What are vertical angles? Are they equal? What is a Jordan Curve? [06/07/2006] What is a simple definition of a Jordan curve I can give my 5th graders? What is a Vertex? [12/06/2001] And what does vertices mean? What is Geometry For? [03/01/2002] What is geometry really for? Page: [

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