With circle graphs it is very difficult to make them accurate, because you need a protractor, legend and several other things and depending on your students comprehension it could be difficult for them. But here is a good way to make a circle graph by using a bar graph. We actually did this in class and it was a lot of fun. First we made our bar graph exact with a ruler and made sure the size was appropriate to the information we were using, (you want to make it big enough but not real big so you can eventually cut it out and make your circle graph). we then cut the individual bars out and taped them end to end to make a circle. We then (depending on how big our circle was) laid it down on several different blank white sheets of paper that we taped together and traced the circle. Next we marked on the outline of the circle where each category was. From there we found the center of the circle by measuring end to end (diameter), then taking that measurement and divided it by 2 to get the radius. We measured the radius a couple of times to other sides of the circle to make sure it would be the same measurement. Once we did that we made lines from the marks we made where the color taped bar/circle graph to the center of the circle and then colored it in accordingly. We then had a perfect circle graphed that was made from a bar graph. Here are some pictures from my experience.
Comparing Graphs Here is a great website I found that helped me a little more to understand the differences between the types of graphs.
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| This is the Bar Graph cut out and taped together |
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| This is the Bar Graph taped in a circle and then the Circle Graph made from the Bar Graph |
I really enjoyed looking at your blog. I think that you did a great job! It was very insightful. I really enjoyed looking at the pictures in this post. It was supper fun to make learn how to make the circle graphs. Good luck on the final!
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