An
eight sided
polygon with
angles adding up to 900
o (degrees). The
area of a
regular octagon is
4.828s2, where
s is the
length of a side.
The
perimeter for a
regular polyhedron is
sn where s is the
length of a side and n is the
number of sides.
Octagons are very bossy and like to tell people to stop. That's why stop signs are made in the shape of octagons--at least, in the USA, they are.
Geometric shapes