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 Diagonals to Quadrilaterals This lesson from Illuminations focuses on quadrilaterals. Students will start with the diagonals of a shape and then deduce the type of quadrilateral that surrounds them. An interactive applet is included that will help learners understand the relationship between diagonals and the shapes they form. The lesson is intended for grades 9-12 and should require 2 class periods to complete. http://illuminations.nctm.org/Lesson.aspx?id=2189
 Dividing a Town into Pizza Delivery Regions This lesson from Illuminations asks students to construct perpendicular bisectors, find circumcenters, calculate area, and use proportions to solve a real-world problem. Concepts taught in the lesson include perpendicular bisectors, the circumcenter of a circle, the Voroni diagram, and using ratios and proportions to solve problems. The lesson is intended for grades 9-12 and should require 2... http://illuminations.nctm.org/Lesson.aspx?id=2688
 Embroidered Math This lesson from Illuminations introduces students to to basic graph theory and Euler circuits. Students will gain hands on experience using graphs. The lesson involves sketching graphs that have Euler paths and circuits. The activity is intended for grades 9-12 and should require 1 class period to complete. http://illuminations.nctm.org/Lesson.aspx?id=2995
 Cutting Conics This lesson from Illuminations explores conic shapes. The shapes circle, ellipse, hyperbola, and parabola are illustrated. Students will discover how to cut a double-napped cone to create the various conic sections. The lesson is intended for grades 9-12 and should require one class period to complete. http://illuminations.nctm.org/Lesson.aspx?id=2907
 Computer Animation This lesson from Illuminations asks students to use matrix multiplication to transform digital images. Students will use matrix multiplication skills, look at the connections between geometric transformations and matrix multiplication, and discover the 2x2 identity matrix. The lesson is intended for grades 9-12 and will require one class period to complete. http://illuminations.nctm.org/Lesson.aspx?id=3141
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