<p>I can not figure out what all the parameters to the arc() function are (by experimentation) and I have not found any tutorial that seems to explain them. Where would a good explanation of the arc() function be?</p>

According to
MDC
:
```
```
arc(x, y, radius, startAngle, endAngle, anticlockwise)
```
```
x, y, and radius are obviously circle parameters.  startAngle and endAngle are in radians, starting east.  anticlockwise is a boolean.