Everyday Math Demystified by Stan Gibilisco

Author:Stan Gibilisco
Language: eng
Format: epub, pdf
Publisher: McGraw-Hill
Published: 2006-04-10T16:00:00+00:00

CHAPTER 10

Geometry in Space

Solid geometry involves points, lines, and planes. The difference between two-dimensional (2D) geometry and three-dimensional (3D) geometry is the fact that, well, there’s an extra dimension! This makes things more interesting, and also more complicated.

Points, Lines, and Planes

A point can be envisioned as an infinitely tiny sphere, having height, width, and depth all equal to zero, but nevertheless possessing a specific location. A point is zero-dimensional (0D). A line can be thought of as an infinitely thin, perfectly straight, infinitely long thread or wire. It is one-dimensional (1D). A plane can be imagined as an infinitely thin, perfectly flat surface having an infinite expanse. It is two-dimensional (2D). Space in the simplest sense is the set of points representing all possible physical locations in the universe at any specific instant in time. Space is three-dimensional (3D).

If time is included in a concept of space, we get four-dimensional (4D) space, also known as hyperspace.

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