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The plane has length and width. The plane also refers to a hypothetical two-dimensional space of infinite extent; this use is used, for example, when describing tilings of the plane. Points on the plane can be shown using two coordinates, written as $(x,y)$. In analogue with Space.

## Objects on the Plane Edit

• Henagon
• Digon
• Triangle
• Square
• Pentagram
• Pentagon
• Hexagon
• heptagon
• octagon
• nonagon
• decagon
• henceagon
• dodecagon
• tridecagon
• icosagon
• tricosagon
• tetracosagon
• pentacosagon
• hexacosagon
• heptacosagon
• octacosagon
• enneacosagon
• hectoton
• chilliagon
• megagon
• gigagon
• teragon
• petagon
• exagon
• zettagon
• yottagon
• Apeirogon

### Flexagons Edit

Polygon has 3 or more faces called flexagon

### Polyominoes Edit

Polyominoes are two-dimensional figures consisting of multiple squares fixed edge-to-edge. There are an infinite number of polyominoes, and the number of polyominoes increases with the amount of squares allowed.

## Coordinates on the Plane Edit

There are two coordinate systems that can be used to define points on the plane - Cartesian coordinates, and polar coordinates.

Cartesian coordinates consist of two distances - the left-right distance from the origin, and the up-down distance from the origin. This is written as $(x,y)$. Cartesian coordinates where either x or y are fixed trace out an infinite line. Cartesian coordinates where both are fixed trace out a point, and where none are fixed trace out a plane.

Polar coordinates consist of a distance and an angle - the overall distance from the origin, and the angle of the point from horizontal. This is written as $(x,\theta )$. Polar coordinates where x is fixed trace out a circle; polar coordinates where θ is fixed trace out an infinite line. Polar coordinates where both are fixed trace out a point, and where none are fixed trace out a plane.

When converting from polar to Cartesian coordinates, the equations $x\cos { \theta } =x$ and $x\sin{\theta } =y$ can be used. When converting from Cartesian to polar coordinates, the equations $\sqrt { { x }^{ 2 }+{ y }^{ 2 } } =x$ and $\tan ^{ -1 }{ (\frac { y }{ x } ) } =\theta$ can be used.

## Dimension Edit

Name: Polygon

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