R help - Feb 2010 - Plot spatial location by using azimuth and distance?

Hey, I have one data like this:

   tree azimuth distance
   1     312      200
   2     322      201
   3     304      173
   4     294      154
   5     313       95

The "azimuth" stands for the azimuth of tree from plot center, and the
"distance" is the distance of tree from plot center.
I want to plot the spatial location of these trees. I want to ask if there is an
easy way to plot it by using the azimuth and the distance, not by transforming
the data to x-y values.

Thanks so much.

                                                          Jian

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