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ELEMENTARY

Arithmetic
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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?

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