Column chart with target line

Combo charts combine more than one Excel chart type in the same chart. One way you can use a combo chart is to show actual values in columns together with a line that shows a goal or target value. In the chart shown in this example, daily sales are plotted in columns, and a line shows target sales of $500 per day.

Calculation of pi

I ran into this chart while looking for examples of XY scatter plots and couldn't resist re-building it, following the instructions outlined way back in 2000 I think. Unfortunately the original link no longer works.

The exercise is to verify the value of pi by plotting the circumference vs. radius of a number of objects measured in a lab. Here is the data:

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