A board covered by a lattice of pegs around which one can span rubber bands to form segments and polygons. It was invented by the Egyptian mathematician and pedagogist Caleb Gattegno (1911-1988) as a manipulative tool for teaching elementary geometry in schools.

The applications range from the comparison of shapes to the arithmetic computation of areas (e.g., Pick's theorem), and the study of transformations in the plane.

See also

Grid, Point Lattice

This entry contributed by Margherita Barile

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Cite this as:

Barile, Margherita. "Geoboard." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein.

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