Plane Geometry is about flat shapes like lines, circles and triangles … shapes that can be drawn on a piece of paper
Solid Geometry is about three dimensional objects like cubes, prisms, cylinders and spheres.
|Hint: Try drawing some of the shapes and angles as you learn … it helps.
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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)
Why do we do Geometry? To discover patterns, find areas, volumes, lengths and angles, and better understand the world around us.
Plane Geometry is all about shapes on a flat surface (like on an endless piece of paper).
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A Polygon is a 2-dimensional shape made of straight lines. Triangles and Rectangles are polygons.
Here are some more:
Circle Theorems (Advanced Topic)
There are many special symbols used in Geometry. Here is a short reference for you:
Congruent and Similar
Types of Angles
Using Drafting Tools
Transformations and Symmetry
More Advanced Topics in Plane Geometry
Trigonometry is a special subject of its own, so you might like to visit:
Solid Geometry is the geometry of three-dimensional space – the kind of space we live in …
… let us start with some of the simplest shapes:
Common 3D Shapes
Polyhedra and Non-Polyhedra
There are two main types of solids, “Polyhedra”, and “Non-Polyhedra”:
Polyhedra (they must have flat faces):
|Cubes and Cuboids (Volume of a Cuboid)|
Non-Polyhedra (when any surface is not flat):