![example picture for mag()](/images/reference/Sketch_mag_0.png)
```python
def setup():
x1 = 20
x2 = 80
y1 = 30
y2 = 70
py5.line(0, 0, x1, y1)
py5.println(py5.mag(x1, y1)) # Prints "36.05551"
py5.line(0, 0, x2, y1)
py5.println(py5.mag(x2, y1)) # Prints "85.44004"
py5.line(0, 0, x1, y2)
py5.println(py5.mag(x1, y2)) # Prints "72.8011"
py5.line(0, 0, x2, y2)
py5.println(py5.mag(x2, y2)) # Prints "106.30146"
```