Question on Coordinate System

[Chris Clemens]

There are three graphs on this page. You might need to hit the enlarge key a few times to make them readable. Can you look and see if on the lower left hand corner of any of these graphs, it is listing a "0" (zero) or an "O" for origin? I am not sure I can tell the difference, but hoping a trained eye can. Thank you.
Susan

[Chris Clemens]

I believe that these are an "O" for origin. If you look specifically at question 33, there is definitely a difference in the shape of the O (at the origin) and the 0 (zero) in the number 320 above it on the y-axis. The zero is always more oval in shape, while the origin is round.
Betty

[betty.marshall]

Thank you, Betty. I have two more questions related to these graphs that I am hoping you can help with. Would you use a number sign with the numbers on the x- and y-coordinates, and can you give me a quick guideline to help me know why or why not. Thank you so much.
Susan

[betty.marshall]

This information is covered in the Guidelines and Standards for Tactile Graphics which is available for download from the BANA website. Near the beginning of Unit 6 Mathematical and Scientific Diagrams there is a chart which indicates when to use the numeric indicator. You omit them for Cartesian Graphs, but include them for Line Graphs. If you consider this to be a Cartesian graph, then you would omit the numeric indicator.
Betty

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