Plane Geometry

If you like drawing, then geometry is for you! Plane Geometry is about flat shapes like lines, circles and triangles ... shapes that can be drawn on a piece of paper Hint: Try drawing some of the shapes and angles as you learn ... it helps. 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)

Plane Geometry is all about shapes on a flat surface (like on an endless piece of paper).  Polygons

A Polygon is a 2-dimensional shape made of straight lines. Triangles and Rectangles are polygons.

Here are some more: Pentagon Pentagram Hexagon

The Circle Symbols

There are many special symbols used in Geometry. Here is a short reference for you:

Geometric Symbols

Angles

Types of Angles Acute Angles Right Angles Obtuse Angles Straight Angle Reflex Angles Full Rotation Using Drafting Tools Transformations and Symmetry  Coordinates More Advanced Topics in Plane Geometry

Pythagoras Conic Sections Trigonometry Trigonometry is a special subject of its own, so you might like to visit: