Plane Geometry
If you like drawing, Geometry is for you!
 | Plane geometry is all about shapes like lines, circles and triangles ... shapes that can be drawn on a flat surface called a Plane (it is like on an endless piece of paper). |
Point, Line, Plane and Solid
A Point has no dimensions, only position
A Line is one-dimensional
A Plane is two dimensional (2D)
A Solid is three-dimensional (3D)
A Line is one-dimensional
A Plane is two dimensional (2D)
A Solid is three-dimensional (3D)
Hint: Try drawing some of the shapes and angles as you learn ... it helps.
Shapes
Polygons
A Polygon is a 2-dimensional shape made of straight lines. Triangles and Rectangles are polygons.
Here are some more:
| Properties of Regular Polygons | |
| Diagonals of Polygons | |
| Interactive Polygons |
The Circle
 | Circle |
| Pi | |
| Circle Sector and Segment | |
| Circle Area by Sectors | |
| Annulus | |
| (Advanced) Circle Theorems | |
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Symbols
There are many special symbols used in Geometry. Here is a short reference for you:
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