ALEX Lesson Plans Subject: Mathematics (9 - 12) Title: Arc Lengths and Sector Areas Description: Students will work in cooperative groups to discover the relationships between arc length, central angle measure, and circumference.  They will also discover the relationship between circle area, central angle measures, and sector area.  Students will share their discoveries and create formulas for calculating arc length and sector area.  Then they will practice these skills in a journal entry and solving a real-life extension. This lesson plan was created by exemplary Alabama Math Teachers through the AMSTI project. Thinkfinity Lesson Plans Subject: MathematicsTitle: Soda Cans      Add Bookmark Description: This reproducible activity sheet, from an Illuminations lesson, guides students through a simulation in which they try different arrangements to make the most efficient use of space and thus pack the most soda cans into a rectangular packing box.Thinkfinity Partner: IlluminationsGrade Span: 9,10,11,12Subject: MathematicsTitle: Circle Packing and Curvature      Add Bookmark Description: In this lesson, one of a three-part unit from Illuminations, students investigate the curvature of circles. Students apply definitions and theorems regarding curvature to solve circle problems. In addition, there are links to an online activity sheet and other related resources.Thinkfinity Partner: IlluminationsGrade Span: 9,10,11,12Subject: MathematicsTitle: Soccer Problem      Add Bookmark Description: This student interactive, from an Illuminations lesson, allows students to investigate a soccer problem by changing the location of a soccer player as well as the distance between the player and the goal posts. The angle changes as the player is moved, and students must therefore determine the player s position so that the angle is maximized.Thinkfinity Partner: IlluminationsGrade Span: 9,10,11,12