A pie graph is used for showing
percentages, that is the number of
items out of a hundred percent. So in
this case we have a poll where we took a
survey to figure out which people liked
which favorite colors and then we
counted up the total for each color and
the total number of votes equals a
hundred percent so the pie represents a
hundred percent and each slice represents
a certain percentage of the vote.
Here's an example where the data could
be made into a pie graph but it doesn't
really make sense. Here we have the
populations of the United States, China
and India. The problem with this is that
it implies that these are the only three
countries in the world and that their
total population equals a hundred
percent of the population of the world,
which is not true. So this one would be
better served with a bar graph rather
than a pie graph.  We'll show you a bar
graph in a different video. Pie graphs
are great for showing surveys, votes or
anything where when you count it all up
and equals a hundred percent at the end.
Setting up the data table for a pie
graph is very easy.  It just takes two
columns. The first column is the
categories, and the second column is the
numbers. The first row of course needs to
be labels. So we're going to, in this case, do
an election with candidates. And the
number of votes.  Now the graph will show
percentages but we don't need to worry
about calculating percentages here, it
will take the number of votes it will
add them all up and make that the total
and then it will make each entry into a
percentage on the graph. You might also
want to make things look nice by maybe
making these bold, perhaps underlining
them so it's clear that those are the names of categories.
Now that your data table is ready to go
you can turn it into a graph. First
highlight the cells that you want to
graph, then Insert -> Chart (they call it
charts here it's the same thing as a 
graph) and here you get to pick out what
kind of chart type you want. They have
recommendations here including very
handily the pie chart but if you want
other types you can go over to the chart
types and you can pick them off this
list. There's a couple of different
styles of pie where it's a donut vs.
a whole pie, or it has sort of a 3-D effect
here. So you can pick any one of those
and it's still the same thing. And then
once you've decided what you want you can
hit Insert.
When you have your graph created there
might be some editing that you need to
do to make it look the way you want. When
you first select the graph you're
probably in View Mode, which means when
you click on items you're not making any
changes, but you can still mouse over
things live and see things like the
raw number of votes, which candidate
goes with which slice, that sort of thing.
I also want to show you that this graph
actually is live in the sense that if
you change the data in the data chart, it actually changes the results of the
graph to match the new data. If you want
to make some edits you can go into quick
edit mode and then when you click on
items you get choices that you can
adjust like font sizes so if you want to make this nice
and big or whether we want it to be at
the top or bottom. There's also choices
here that affect the whole graph. So for
example, the font choices, background
colors and so forth. And then if that
isn't enough you can also go to this
little drop down menu and you can go to
Advanced Edit, and that brings you
back to the chart editor that we started
with and there are a lot more choices
you have here as well. For example, let's
say you don't want these to show
percentages on the pie slices but you
instead want to show the actual number
of votes, that's called Value. Or whether
you want it to actually have the label, so
in other words the candidate's name on
top of each slice. So those are things
you can change here on this
customization tab.
