Note that the long
expression for the sum of the angles has been truncated. If expressions
are longer than twenty characters they will be truncated in this
fashion. To add evidence for our sum of angles formula, move the
vertices of the quad to another configuration, select the table, and
click "Add to Table" under the Measure menu. A new column of data will
be added to the table.
The sum of the angles is
still 360. We could addinmg columns to our table to get more and
more data for our conjecture. Now, suppose we did not like the
last truncated label in the table. To edit the table, we select the
table and choose "Edit Table..." under the Measure menu. The
dialog box below will appear. To change an entry we just click on
that entry in the list and type in a new label. In this case, we
change the name to "Sum of Angles." Once we click OKAY, the new label
will appear in our table.