![](https://spiremaths.co.uk/wp-content/uploads/CircleCircumference.gif)
Lesson visual of PowerPoint/ActivInspire
Find the circumference of a circle from polygons inscribed in a circle. Measure and calculate. Included here are the following:
- PowerPoint file
- ActivInspire flipchart
- Teacher notes
- Excel file
- Geogebra interactives (no program needed) here and here.
![](https://spiremaths.co.uk/wp-content/uploads/CircleCircumference.png)