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).
- Quadrilaterals (Rhombus, Parallelogram, and so on)
- Rectangle, Rhombus, Square, Parallelogram, Trapezoid and Kite
- Interactive Quadrilaterals
- Parallelogram In Any Quadrilateral
- Paper Sizes
- Shapes Freeplay
Polygons
A Polygon is a 2-dimensional 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 and Sine
Circle Theorems (Advanced Topic)
Symbols
There are many special symbols used in Geometry. Here's a short reference for you:
Congruent and Similar
Angles
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Using Drafting Tools
- Geometric Constructions
- Using the Protractor
- Constructing Triangles
- 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
Triangle Concepts
Trigonometry
Trigonometry is a special subject of its own, so you might like to visit: