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Definition of
decagon:
A
plane
figure
having
ten
sides
and
ten
angles
;
any
figure
having
ten
angles
.
A
regular
decagon
is
one
that
has
all
its
sides
and
angles
equal
.
Synonyms:
Usage examples:
The
purpose
of
this
problem
is
to
prepare
for
the
construction
of
the
regular
decagon
and
pentagon
.
- "The Teaching of Geometry", David Eugene Smith.