摘要
This is a lesson integrated with multiple approaches in geometry classroom to deepen middle school students’understanding of geometry and spatial sense in the topic of sums of interior angles in polygons.In three activities,teachers lead students to explore the pattern of interior angles throughout folding paper Origami,constructing animated polygons in Geometer’s Sketchpad,and establishing proof with Parallel Line Theorem.The lesson plan is developed with detailed procedures and prompting questions.The goal of the lesson is to identify the pattern of interior angles in polygons and to analyze the relationship among polygons in the setting of 25 to 30 middle school students.
