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eBook
Ck 12: Interactive Geometry: 1.1 the Three Dimensions eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 1.1 the Three Dimensions

For Students 9th - 10th
In order to better understand why your world is three dimensional, consider zero, one and two dimensions.
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Handout
Wolfram Math World: Z Axis Handout
Wolfram Research

Wolfram Math World: Z Axis

For Students 9th - 10th
Contains a graphical representation of the z-axis in a 3D cartesian coordinate plane and expresses it's normal orientation. Site has related links.
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