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Points, Lines, Angles, and Planes
Points, Lines, Angles, and Planes
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Dimensions and Extensions

So far everything we've been doing has been flat, boring, two-dimensional. It's time to add some depth to things (and to show how hard it is to draw depth on a sheet of paper or a computer screen).

As you've hopefully noticed at some point in your life, the world is more than a single sheet of paper. In fact, you can have several different sheets of paper, oriented in several different ways. But this is about geometry, not the state of your backpack.

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