A blog about teaching and learning in a maths classroom.

Tuesday, 14 April 2009 | 1 Comment

I need to learn to use GeoGebra because it looks like a fantastic app, it’s free and shortly our students will have their own netbooks, itching to use them. I find the best way to learn new software is to do something with it that you need.

With Year 8, we’ll soon look at the Circle, starting with parts of the circle. I would normally do a matching activity – given names and definitions, students match those to a diagram. I will still do that, but want to also **show** them these parts and how they are different to each other – hence GeoGebra.

I’ve put together an interactive GeoGebra widget, Parts of a Circle. To use it, just turn on/off the various parts. Also make sure you move some of the points to see how a part changes, e.g. sectors can be big or small or a quadrant always has an angle of 90°.

If you want to use this in class, as is, this version has the widget on a black background with nothing else. Or, you might want to modify the GeoGebra file and make your own version.

Parts of a Circle - GeoGebra
GGB, 4 KB

This work is licensed under a Creative Commons License (?).

Posted in • Lesson Idea • Circles • Software • GeoGebra • Technology • IWB • Projector Resource | Short URL: http://mths.co/1466

New Subscribe to the …

MathsLinksemail newsletter

**Simon Job** — eleventh year of teaching maths in a public high school in Western Sydney, Australia.

**MathsClass** is about teaching and learning in a maths classroom. more→

@simonjob

updates via @mathslinks

Sydney University abandons HSC prerequisites in diversity push

mathsSeven ways to use diagnostic questions to check for understanding

maths bartonDeveloping a departmental approach to problem-solving

maths bartonDeveloping a departmental approach to reviewing answers

maths bartonDeveloping a departmental approach to worked examples

maths barton workedexamples examples

## Comments