Graph 2. The Pipit's Spring Migration

　　focus on the points of intersection rather than the line segments between the points，This type of graph is most commonly used to show how something changes over time. Here is a graph that charts how far a bird flies during the first five days of its spring migration(See Graph 2)．

　　The unit of measurement for the x－axis is days. The unit of measurement for the yaxis is kilometers. Thus we can see that，on the first day，the pipit flew 20 kilometers. The line segment goes up between Day 1 and Day 2，which means that the bird flew farther on Day 2.If the line segment angled down，as between Day 4 and Day 5，it would mean that the bird flew fewer kilometers than the day before. This line graph is a quick，visual way to tell the reader about the bird's migration.

　　Pie Graphs

　　Graph 3. Amy's June Expenses

　　A typical pie graph looks like a circular pie. The circle is divided into sections，and each section represents a fraction of the data. The graph is commonly used to show percentages; the whole pie represents 100 percent，so each piece is a fraction of the whole.

　　A pie graph might include a legend，or it might use icons or labels within each slice. This pie graph shows one month's expense(See Graph 3)．

　　Food $25

　　Movies $12

　　Clothing $36

　　Savings $20

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