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thebookofshaders/glossary/length.md

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## Length
Calculate the length of a vector
### Declaration
```glsl
float length(float x)
float length(vec2 x)
float length(vec3 x)
float length(vec4 x)
```
### Parameters
```x``` specifies a vector of which to calculate the length.
### Description
```length()``` returns the length of the vector.
<div class="codeAndCanvas" data="../07/circle-making.frag"></div>
### See Also
[distance()](index.html#distance.md), [normalize()](index.html#normalize.md), [Chapter 07: Shapes](../07/)