January 28, 2010
Geoboard projects can be done without nails by doing rubbings on LEGO®
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.
A = P/2 + I - 1