# 3D

(Redirected from 3-D)
A 3D box

3D (or 3-D) means three-dimensional, or having three dimensions. For example, a box is three-dimensional; it is solid, and not thin like a piece of paper. It has volume, a top and bottom, left and right (sides), as well as a front and back. You can turn the box around to view it from another side (called a face, surface or simply side).

A dimension is measurable in inches, centimeters, miles, kilometers, or any other unit of length.

The three dimensions are called length (or depth), width (or breadth), and height.

3D graphics are used to make video games or animated movies. A lot of calculations are needed to make pictures seem three-dimensional on a screen.

## In mathematics

Picture of the "X axis", "Y axis", and "Z axis".
A 3D mathematical picture, or graph, with lines measuring width, height, and length.

In mathematics (maths), length, width, and height are given letters (variables) to make them easier to write, or if a value is not known. X is width, Y is height, and Z is length. Another common 3D coordinate system is the spherical coordinate system.

The mathematical study of shapes and dimensions is called geometry. Geometry can be used to measure how tall a mountain is.

## Time

Some people see time as a fourth dimension. It is also measured. It is measured in units of time such as seconds, hours, years, or any other measurement of time.[[ja:3次元 ]]