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## 3.3 Figure size

In `Asymptote`, coordinates like `(0,0)` and `(100,100)`, called pairs, are expressed in `PostScript` "big points" (1 `bp` = 1/72 `inch`) and the default line width is `0.5bp`. However, it is often inconvenient to work directly in `PostScript` coordinates. The next example produces identical output to the previous example, by scaling the line `(0,0)--(1,1)` to fit a rectangle of width `100.5 bp` and height `100.5 bp` (the extra `0.5bp` accounts for the line width):

```size(100.5,100.5);
draw((0,0)--(1,1));
```

One can also specify the size in `pt` (1 `pt` = 1/72.27 `inch`), `cm`, `mm`, or `inches`. Two nonzero size arguments (or a single size argument) restrict the size in both directions, preserving the aspect ratio. If 0 is given as a size argument, no restriction is made in that direction; the overall scaling will be determined by the other direction (see size):

```size(0,100.5);
draw((0,0)--(2,1),Arrow);
```

To connect several points and create a cyclic path, use the `cycle` keyword:

```size(3cm);
draw((0,0)--(1,0)--(1,1)--(0,1)--cycle);
```

For convenience, the path `(0,0)--(1,0)--(1,1)--(0,1)--cycle` may be replaced with the predefined variable `unitsquare`, or equivalently, `box((0,0),(1,1))`.

To make the user coordinates represent multiples of exactly `1cm`:

```unitsize(1cm);
draw(unitsquare);
```

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