### 227 Geometry Videos by Khan Academy

We are surrounded by space. And that space contains lots of things. And these things have shapes. In geometry we are concerned with the nature of shapes, how we define them, and what they teach us about the world, from physics to architecture to biology to astronomy (and much more). Some of the specific topics taught by these **Geometry Video tutorials** include angles, intersecting lines, right triangles, perimeter, area, volume, circles, triangles, quadrilaterals, analytic geometry, and geometric constructions.

This **zip file of Geometry lesson videos** from Khan Academy will teach students all of the important areas of geometry. To access the videos, you will need to download this zip file (715MB in size), and after unzipping it, the videos and content will be in a folder named “227 Geometry Videos by Khan Academy”. Then just click or select the “index.html” file to view the videos home page in your browser, as seen in the screen shot below. No internet connection is needed since they are already downloaded. Related to learning geometry are these video lesson/tutorial posts covering algebra I and algebra II and trigonometry.

### Geometry Topics Taught by of these Video Lessons

**Introduction to Euclidean geometry (8 videos)**Roughly 2400 years ago, Euclid of Alexandria wrote Elements which served as the world’s geometry textbook until recently. Studied by Abraham Lincoln in order to sharpen his mind and truly appreciate mathematical deduction, it is still the basis of what we consider a first year course in geometry. This tutorial gives a bit of this background and then lays the conceptual foundation of points, lines, circles and planes that we will use as we journey through the world of Euclid.

**Angles and intersecting lines (36 videos)**This topic continues our journey through the world of Euclid by helping us understand angles and how they can relate to each other.

**Congruence (20 videos)**If you can take one figure and flip, shift and rotate (not resize) it to be identical to another figure, then the two figures are congruent. This topic explores this foundational idea in geometry.

**Similarity (14 videos)**Right triangles and trigonometry (28 videos)

Triangles are not always right (although they are never wrong), but when they are it opens up an exciting world of possibilities. Not only are right triangles cool in their own right (pun intended), they are the basis of very important ideas in analytic geometry (the distance between two points in space) and trigonometry.

**Perimeter, area, and volume (34 videos)**A broad set of tutorials covering perimeter area and volume with and without algebra.

**Circles (17 videos)**Special properties and parts of triangles (21 videos)

You probably like triangles. You think they are useful. They show up a lot. What you’ll see in this topic is that they are far more magical and mystical than you ever imagined!

**Quadrilaterals (12 videos)**Transformations (20 videos)

Let’s think more visually about things like shifts, rotations, scaling and symmetry.

**Analytic geometry (8 videos)**Geometric constructions (8 videos)

We now have fancy computers to help us perfectly draw things, but have you ever wondered how people drew perfect circles or angle bisectors or perpendicular bisectors back in the day. Well this tutorial will have you doing just as your grandparents did (actually, a little different since you’ll still be using a computer to draw circles and lines with a virtual compass and straightedge).

**Worked examples (18 videos)**Sal does the 80 problems from the released questions from the California Standards Test for Geometry. Basic understanding of Algebra I necessary.

*– love learning -your best ed lessons guide, Scott*

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