Dividing paths is one way to do what you wish and retain
properties in the result.
In this case a circle over a triangle then Divide paths may
do the trick
(I am too new to FW and how it does things and have not
checked it out
as I'm in a bit of a rush. perhaps you could do so and post
> How do I errase stuff in fireworks? For example, I have
a cirle, and I want to errase about 30 percent of that
circle....like an erraser tool in paint. How do I do that?