The geoboard provides a nicely constrained environment for mathematical exploration, and lends itself to many activities where students can discover or apply important ideas in the K-12 curriculum. This page is a hopefully comprehensive list of links to geoboard activities on this site and on my blog.

All activities I link to below can be done on the CircleTrig Geoboard, a two-sided manipulative I designed. On one side, an 11 by 11 traditional geoboard. On the other side, a circle geoboard, with radius 10 cm, and a 360° protractor. It is available from Nasco.

(However, most can be done on traditional 11 by 11 geoboards, or traditional circle geoboards.)

## 11 by 11 Geoboard

Geometry Labs(free download)Area:Labs 8.4-8.6, 9.5

Distance:Labs 9.2, 9.4, 9.6

Similarity, Slope:Labs 10.1, 10.2

Algebra: Themes, Tools, Concepts(free download)(Some of these lessons overlap and complement the ones inGeometry Labs)

Area:Lessons 1.12, 2.12, 4.12, 6.12, 11.A

Distance, Square RootsLessons 6.12, 7.12, 9.1-9.4, 9.A, 9.9, 9.C,

Similarity, Slope:Lessons 3.12, 8.3, 11.3## Blog posts

Geoboards and Dot Paper

Geoboard Triangles

Inscribing Geoboard Squares in Polyominoes

No Three on a Line

Heilbronn's Triangle

Ariadne's String## On this site

A debate about the geoboard

Proving Pick's Formula

Dot Papers

Connecting the Dots! (presentation slides): html | PDF | Keynote## Elsewhere

Virtual Geoboard (on the NRICH site in the UK)

## Circle Geoboard

Geometry Labs(free download)Angles:Labs 1.7-1.9

Symmetry:Lab 5.5

Area:Labs 9.5, 11.7

Basic trig:Labs 11.1-11.7

(All but the trig activities can be done on any circle geoboard. The trig activities require the CircleTrig geoboard.)## On this site

(excerpts fromGeometry Labs)

Angles

The 10cm Circle

10-cm circle paper