"In this lesson, students draw various polygons and investigate their interior angles. The investigation is done using both an applet and paper and pencil to foster an understanding of how different patterns can lead to the same solution. After comparing results with a partner, students develop a formula showing the relationship between the number of sides of a polygon and the sum of the interior angles." (from NCTM Illuminations)

- Subject:
- Mathematics
- Material Type:
- Interactive
- Lesson Plan
- Provider:
- National Council of Teachers of Mathematics
- Provider Set:
- Illuminations
- Author:
- National Council of Teacher's of Mathematics