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 Graphs from the Unit Circle This lesson from Illuminations teaches students the features of sine and cosine graphs. Students use uncooked spaghetti to demonstrate the properties of the unit circle, which they will then represent with graphs. It is intended for students who have already learned about unit circle trigonometry, and is best for upper level high school classes. The lesson should require 3 class periods to... http://illuminations.nctm.org/Lesson.aspx?id=2870
 Maths Doctor: Shape and Space The Maths Doctor website from Macmillan Publishers contains more than 250 lessons that are free for anyone. Each lesson includes a three to five minute video tutorial on the topic and a related worksheet for the student to complete. Each worksheet has a convenient QR code that a student can scan to access the video. The Shape and Space section includes numerous lessons on topics ranging from... http://www.mathsdoctor.co.uk/resources/
 The Circle This learning object from Wisc-Online covers the circle, examining the properties and components of a circle, and using the geometric formula for finding the circumference and area of a circle. Practice questions are also included. https://www.wisc-online.com/learn/formal-science/mathematics...
 Slice of Pi This lesson uses WebImage, a Web-based customized version of ImageJ, to investigate the relationship between the circumference and diameter of a circle. Images of circular objects are provided, and, by measuring diameter and circumference, students are able to obtain an approximate value of Pi. They also explore the history behind Pi and how to find its value. http://www.simplescience.org/Lessons/Phys_Sci_Math/SP/Lesson...
 The Geometry Junkyard The Geometry Junkyard website provides a broad introduction to the specifics of geometry. The site, designed by David Eppstein of UC-Irvine, provides all the basics of geometry for students and teachers alike. Topics range from the mathematics of shapes to fractals and multi-dimensional geometry, to name only a few. Also provided are various lesson plans for different levels of education. The... http://www.ics.uci.edu/%7Eeppstein/junkyard/topic.html
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