Figure 1-30.

Pie chart segments and clock positions

To determine the size of each segment, you must calculate the percentage

of the total budget each segment represents. To do this, you divide the

amount of the budget expenditure each segment represents (miscellaneous,

utilities, transportation, food, and housing) by the total budget amount

(,000):

(b) Plotting segments with a percentage protractor.

At this

point, you have all the information you need to plot the segments on the

circle using a percentage protractor.

When you use a percentage

protractor, you plot the percentage each segment represents.

Most

percentage protractors have 1/2 percent graduations (figure 1-31).

Since a pie chart starts at the 12 o'clock position, place the "0"

graduation there (which places the 50% graduation at the 6 o'clock

position). The largest segment of the pie chart is 32.5%, so it is the

first segment you plot.

You move clockwise from the "0" percent

graduation to the 32.5% graduation and plot that point on the circle.

Once you plot this section, you plot the remaining segments, largest to

smallest, clockwise. When you have plotted all the segments, you draw a

radius from each point to the center of the circle.

The first (largest) segment of the pie

chart ends at 32.5% graduation;

therefore, 32.5% serves as the starting

point of the next segment. The

next segment you must plot presents 25%

of the pie chart. To find the

ending point of this segment, you add

the starting point of the last

segment to the percentage of