Graphs can be misleading by having a break in them, not starting at zero, or go up by a certain nuber and then another number completely (ex:up by 1's and then up by 3's). Commercials for companies usually use misleading graphs to enfluence people to buy their porduct. In other words, they lie to get more customers but don't really lie- they just break up the graph to a certain point.
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Bar graphs and line graphs.
The answer depends on what information is graphed. There are distance-time graphs, velocity-time graphs, speed-time graphs, acceleration-time graphs.
Bar graphs can compare two sets of data, as well as line graphs and circle graphs. To better improve my answer, double line graphs and double bar graphs compare two sets of data. Circle graphs cannot however, because they compare parts of a whole instead of, as a bar graph would, the amount of something. A circle graph is also incapable of showing data growth over a period of time, as line graphs do. All in all, circle graphs cannot compare to sets of data, and bar graphs and line graphs must be doubled to do so.
Mathematicians use graphs to illustrate information.
Bar graphs and line graphs.