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 Pi Filling, Archimededs Style! This math unit from Illuminations asks students to inscribe and circumscribe regular polygons. They will then analyze the area of the polygons, using either an applet or a graphing calculator. The unit includes two lessons, "Inscribed and Circumscribed Polygons" and "Improving Archimedes' Method." Together they should require 3 class periods to complete, and are most appropriate for high school... http://illuminations.nctm.org/LessonDetail.aspx?id=U179
 Do I Have to Mow the Whole Thing? This lesson from Illuminations looks at inverse variation. Students are asked to use estimates to measure the height of an object, visualize two-dimensional objects and calculate their area, and sketch graphs to determine the equations for inverse variation relationships. The lesson is intended for grades 9-12 and should require 1 class period. http://illuminations.nctm.org/Lesson.aspx?id=2578
 Squares On A Triangle This lesson will help students understand the law of cosines and the Pythagorean theorem. The material has students find out whether a triangle is acute, obtuse, or right; determine a formula for the law of cosines to relate the sides of any type of triangle, and explain how the Law of Cosines is an extension of the Pythagorean theorem. Student activity sheets are included. This material is... http://illuminations.nctm.org/Lesson.aspx?id=2517
 Centre for Innovation in Mathematics Teaching: Interactive Tutorials (Book 7) Based at the University of Plymouth, the Centre for Innovation in Mathematics Teaching has developed many instructional materials designed to help both novice and experienced math teachers. This particular area of the website provides access to a number of interactive mathematics tutorials. The materials cover a variety of basic algebra and mathematics topics. Example questions and exercises are... http://www.cimt.plymouth.ac.uk/projects/mepres/book7/book7in...
 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/
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