Prism




http://www.ehow.com/video_4755241_what-prism.html

http://en.wikipedia.org/wiki/Prism_(optics)

http://www.math.com/school/subject3/lessons/S3U4L2GL.html

http://www.icoachmath.com/SiteMap/Prism.html

http://www.mathsisfun.com/geometry/prisms.html

http://www.mathsisfun.com/definitions/prism.html

http://mathforum.org/dr.math/faq/formulas/faq.prism.html

http://www.ehow.com/facts_5006127_what-prism-math.html