Geoboard is a free iPad app used to explore a variety of mathematical topics. In addition there is a Geoboard app for the iPhone. It is intended for the elementary and middle grades.
Students stretch virtual bands around pegs to form line segments and polygons and to make discoveries about perimeter, area, angles, congruence, fractions, and more.
- Create line segments and polygons by stretching bands around the Geoboard’s pegs.
- Choose from 5 different band colors; 8 band colors on the iPad.
- Fill individual shapes with a transparent color, or use the Fill All button to toggle all the bands between filled and unfilled.
- On the iPad, switch between the standard 25-peg board and the expanded board with 150 pegs. The larger board makes it possible for students to create a wider variety of configurations.
In addition there is a web app: