Math for Everybody - Easy, Simple, Fun
Quatr.us answers questions

Simple Math

parts of a circle
The parts of a circle

Numbers

3-D Solids

Algebra

Simple Operations

Circles

Math Projects

Geometry

Triangles

Quadrilaterals

Bibliography and further reading about math:

Physics
History of Mathematics
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Professor Carr

Karen Eva Carr, PhD.
Assoc. Professor Emerita, History
Portland State University

Professor Carr holds a B.A. with high honors from Cornell University in classics and archaeology, and her M.A. and PhD. from the University of Michigan in Classical Art and Archaeology. She has excavated in Scotland, Cyprus, Greece, Israel, and Tunisia, and she has been teaching history to university students for a very long time.

Professor Carr's PSU page

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Quatr.us celebrates the victory of the Sioux people and their allies at Standing Rock. Here's more about the history of the Sioux and some of their neighbors: the Mandan, the Crow, the Cree, the Shoshone, and the Paiute. And about global warming.