(360) by 100% (total comparison, you can determine how many degrees of
the circle makeup 1 percent:
360 + 100% = 3.6 degrees in 1 percent.
At this point, you know that 3.6 degrees of the circle equals 1 percent,
and you know the percentage each segment represents. With this
information, you can determine the number of degrees each segment uses
by multiplying each segment's percentage by 3.6 (the number degrees in
1%):
To plot the segments using a standard protractor (figure 132), place
the "0" graduation at the 12 o'clock position (this places the 180
graduation at the 6 o'clock position). The largest segment of the pie
chart is 1170; therefore, it is the first segment you plot, moving
clockwise from the "0" percent graduation and marking that point on the
circle.
Figure 132. Standard protractor
The first (largest) segment of the pie chart ends at 117; therefore,
117 is the starting point of the next segment. The next segment you
must plot uses 90 of the pie chart. To find the ending point of this
segment you add the starting point of the
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