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 onedimensional
A Plane is two dimensional (2D)
A Solid is threedimensional (3D)
Plane Geometry is all about shapes on a flat surface (like on an endless piece of paper).
 Quadrilaterals (Rhombus, Parallelogram, etc)
 Rectangle, Rhombus, Square, Parallelogram, Trapezoid and Kite
 Interactive Quadrilaterals
 Parallelogram In Any Quadrilateral
 Paper Sizes
 Shapes Freeplay
Polygons
A Polygon is a 2dimensional shape made of straight lines. Triangles and Rectangles are polygons.
Here are some more:
The Circle
 Circle
 Pi
 Circle Area by Lines
 Circle Sector and Segment
 Circle Area by Sectors
 Activity: Dropping a Coin onto a Grid
 Arc
 Annulus
Circle Theorems (Advanced Topic)
Symbols
There are many special symbols used in Geometry. Here is a short reference for you:
Congruent and Similar
Angles


Using Drafting Tools
 Geometric Constructions
 Using the Protractor
 Using the Drafting Triangle and Ruler
 Using a Ruler and Compass
Transformations and Symmetry
Coordinates
More Advanced Topics in Plane Geometry
Pythagoras
Conic Sections
Circle Theorems
 Circle Theorems
 Tangent and Secant Lines
 Intersecting Secants Theorem
 Intersecting Chords Theorem
 Angle of Intersecting Secants Theorem
Trigonometry
Trigonometry is a special subject of its own, so you might like to visit: