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Angles - Acute, Obtuse, Straight and Right

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In geometry a line:

is straight (no bends),

has no thickness, and

extends in both directions without end (infinitely).

A line has no ends !

Play With It

Change the position of points A and B. Note that the line AB extends forever in both directions:

Line Segment

When it does have ends it is called a " Line Segment".

Ray

When it has just one end it is called a " Ray"

This is Cool

Now play with this one ... point "C" is made to always be an equal distance from point "A" and "B". The result is a line (all the possible position of point "C" make a line):

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)

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In geometry a line: is straight (no bends), has no thickness, and extends in both directions without end (infinitely). A line has no ends ! Change the position of points A and B. Note that the line AB extends forever in both directions: When it does have ends it is called a " Line Segment".

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Geometry is all about shapes and their properties.

If you like playing with objects, or like drawing, then geometry is for you!

Geometry can be divided into:

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.

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?

Why do we do Geometry? To discover patterns, find areas, volumes, lengths and angles, and better understand the world around us.

Plane Geometry

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:

The Circle

Circle Theorems (Advanced Topic)

Symbols

There are many special symbols used in Geometry. Here is a short reference for you:
Geometric Symbols
Congruent and Similar

Angles

Types of Angles

Using Drafting Tools

Transformations and Symmetry

Transformations:

Coordinates

More Advanced Topics in Plane Geometry

Pythagoras

Conic Sections

Circle Theorems
Triangle Centers
Trigonometry

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

Solid Geometry

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):

Non-Polyhedra (when any surface is not flat):

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Geometry is all about shapes and their properties. If you like playing with objects, or like drawing, then geometry is for you! Geometry can be divided into: Plane Geometry is about flat shapes like lines, circles and triangles ...

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Learn math the fun way with our free educational games! With animation, music, and lots of fun- kids can enjoy practicing math and increase their math skills and math memory.

Topics include: addition, subtraction, multiplication, division, fractions, decimals, numbers, geometry, shapes, early math, integers, time, measurement and much more!

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grade 4  free math games practice common core standards

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Practice identifying parallel, perpendicular and intersecting lines.

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grade 4  free math games practice common core standards

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Unlock harder levels by getting an average of 80% or higher.

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An Overview

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Right, Acute, Obtuse

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This song describes how lines and rays differ. This is just one of the elementary math songs on this channel. Please subscribe!!