January 28, 2010

Geoboard projects can be done without nails by doing rubbings on LEGO® plates
with the side of a crayon without paper wrapping.

Shapes can be divided up into squares and rectangles.

Duplo rubbings work, also.


After a large number of examples
try to figure out a formula for
Area using half the number of Perimeter points, the number of points in the Interior, and 1.

Links of Linda Hamilton
With support from


A = P/2 + I - 1