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Didactics of Mathematic
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POLIGONOS- ELEMENTS-THEORY
Polygonal line . Line formed by several consecutive rectilinear segments
belongsscientific adistinstraight lines. At the fisure is representhere is a lineea polgonal absure
of origin Aand extremeor F.
Definitionof po ligon.Parts ofThe limited planeas for onelinecopgonalclosed (he
originand the endcoincide) in which the segments do not cross andthe vertices
belongto only two segments.
It is not polygono
The perimeter of a polygon is calledthe sum of the longlengths of its sides (segments)
of the polygonal line).
According to the number ofsides, polygons are calledfrom: triangleulos (3),
quadrilaterals (4), pentagons (5), hexagons (6), heptagons (7), octagonsono (8),
nonagon (9), decagon (10), hendecagon (11), dodecagon (12), pentadecagon (15),
icosigono (20). In general, a polygon with n sides is called n- ago no.
We call vertex to cadto one of the intersection points of two consecutive sides.
Angles andin a policegono. The angle ulo formed by two consecutive sides on the inside
of the polygon is an interior angle of the polygon and the one thatforms a side with the
extension of another consecutive side is an exterior angle.
A polygon is convexwhen all its angles arePrevious ones are minors of 180º.
A polygon is convex if when joining twoany interior points, the segment
built is completely included in the polygon.
A polygon is concave when some interior angle is greater than the other.andor 180º
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