Difference between revisions of "Pentagon"
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# <math>AGHIJ</math> is a regular pentagon. | # <math>AGHIJ</math> is a regular pentagon. | ||
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*[[Polygon]] | *[[Polygon]] | ||
Revision as of 16:40, 25 December 2007
In geometry, a pentagon is a polygon with 5 sides. Each angle of a regular pentagon is . The sum of the internal angles of any pentagon is
.
Construction
It is possible to construct a regular pentagon with compass and straightedge:
- Draw circle
(red).
- Draw diameter
and construct a perpendicular radius through
.
- Construct the midpoint of
, and label it
.
- Draw
(green).
- Construct the angle bisector of
, and label its intersection with
as
(pink).
- Construct a perpendicular to
at
.
- Adjust your compass to length
, and mark off points
,
and
on circle
.
is a regular pentagon.
See Also
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