# Polygon

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Difference (from prior major revision) (minor diff, author diff)

Changed: 1c1,3
 Generally, the word polygon is used to refer to a two dimensional construction that encloses a space using straight lines. Regular polygons have sides that are of equal length and have equal angles between each side. 'Poly-' is from the Greek word for 'many' and '-gon' is a Greek combining form meaning 'angle'. Strictly speaking, every polyhedron is also a polygon as is every polytope, since they all have angles.
 Generally, the word polygon is used to refer to a two dimensional construction that encloses a space using straight lines. Regular polygons have sides that are of equal length and have equal angles between each side. [Concave polygon]?s have at least one internal angle that is greater than 180°, whereas convex polygons have all internal angles less than 180°. A cyclic polygon has all of its vertexes lying on the same circle. A polygon can belong to several classifications simultaneously; a square is a regular, convex, cyclic polygon, for example. 'Poly-' is from the Greek word for 'many' and '-gon' is a Greek combining form meaning 'angle'. Strictly speaking, every polyhedron is also a polygon as is every polytope, since they all have angles.

Changed: 5,15c7,18

Name Sides Angle* Triangle 3 60° Square 4 90° Pentagon 5 108° Hexagon? 6 120° Septagon 7 128.57° Octagon 8 135° Nonagon 9 140° Hectagon 100 176.4° Megagon 106 180.° Googolgon 10100 180.°

Name Sides Angle* Triangle 3 60° Square 4 90° Pentagon 5 108° Hexagon? 6 120° Septagon 7 128.57° Octagon 8 135° Nonagon 9 140° Decagon 10 144° Hectagon 100 176.4° Megagon 106 180.° (approx.) Googolgon 10100 180.° (approx.)

Generally, the word polygon is used to refer to a two dimensional construction that encloses a space using straight lines. Regular polygons have sides that are of equal length and have equal angles between each side. [Concave polygon]?s have at least one internal angle that is greater than 180°, whereas convex polygons have all internal angles less than 180°. A cyclic polygon has all of its vertexes lying on the same circle. A polygon can belong to several classifications simultaneously; a square is a regular, convex, cyclic polygon, for example.

'Poly-' is from the Greek word for 'many' and '-gon' is a Greek combining form meaning 'angle'. Strictly speaking, every polyhedron is also a polygon as is every polytope, since they all have angles.

Regular Polygons

Name Sides Angle*
Triangle 3 60°
Square 4 90°
Pentagon 5 108°
Hexagon? 6 120°
Septagon 7 128.57°
Octagon 8 135°
Nonagon 9 140°
Decagon 10 144°
Hectagon 100 176.4°
Megagon 106 180.° (approx.)
Googolgon 10100 180.° (approx.)

``` * Angle= 180°-(360°/ Sides )
```

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