



That
pizza trick from the last page works on any shape



where
the angles and sides are the same. 





Example: 


Find the
area of the octagon ... 











Remember,
the apothem cuts each side into two pieces. 


That
means we get twice as many triangles as sides. 





Example: 


Find the
area of this square 


using the
apothem method ... 











OK, so
maybe we already had ways 


to
calculate the area of a square. 


But now
we know that the apothem method really works! 





copyright 2005 Bruce Kirkpatrick 
