# Flat Surface

Probably the most boring surface type, but one of the most useful. The flat surface is well-flat. There are no properties of the flat surface to change its shape. The standard kinds of surface manipulation apply. Below is the sag for a Flat surface, again boring.

$$
z(x,y) = 0
$$

<figure><img src="/files/ETNMuEls62I6dPUcHGoV" alt=""><figcaption><p>Example of a Flat surface. There really aren't any properties to speak of.</p></figcaption></figure>


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