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What Are The Two Main Branches Of Geometry?

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The two branches of Geometry are:
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)

Solid Geometry - is the geometry of three-dimensional space, the kind of space we live in ...
Three Dimensions
It is called three-dimensional, or 3D because there are three dimensions: Width, depth and height.

There are two main types of solids, "Polyhedra", and "Non-Polyhedra":
Polyhedra
A polyhedron is a solid made of flat surfaces. Each surface is a polygon. Examples:

Platonic Solids
Prisms
Pyramids

Non-Polyhedra
Some solids have curved surfaces, or a mix of curved and flat surfaces (so they aren't polyhedra). Examples:

Sphere  
Torus
Cylinder  
Cone

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