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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
 Pi Line This lesson from Illuminations asks students to measure the diameter and circumference of various circular objects, plot the measurements on a graph, and relate the slope of the line to π, the ratio of circumference to diameter. A student activity sheet is included. The material is appropriate for grades 9-12 and should require 1 class period to complete. http://illuminations.nctm.org/Lesson.aspx?id=1860
 Rolling Into Radians This algebra lesson from Illuminations has students collect data for rolling objects of differing sizes in order to further understand periodic phenomena. They will then create two sinusoidal graphs of the data. Activity sheets and student questions are included. This material is intended for grades 9-12 and should require 1 class period to complete. http://illuminations.nctm.org/Lesson.aspx?id=3151
 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...
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