(1)  Solomon, Robert.  The Little Book of Mathematical Principles, Theories, & Things .  New York: Metro Books, 2008.

(2)  Sheldrick Ross, C. (1992). Circles: Shapes in math, science and nature. Toronto: Kids Can Press Ltd. ISBN 1-55074-064-4

(3)  Angel, Allen R., Abbott, Christine D., and Runde, Dennis C.  A Survey of Mathematics with Applications.  Boston:  Pearson – Addison Wesley, 2005.

(4)  Coy, Peter.  “20 Things You Didn’t Know About Math.”  Discover  March 2012: 80.

(5)  Maor, Eli.  Trigonometric Delights.  New Jersey:  Princeton University Press, 1998.


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