Obieve: To experimentally determine the relationship between diameter and circumference of a circular object. Procedure: Measure the diameter of bottle caps using a metric ruler. Measure the circumference of the cap by wrapping a string around it and measuring the string with a ruler. Make sure to use a very small and very large cap. Graph the diameter on the x-axis and circumference on the y-axis. Use proper graphing techniques. Caр Diameter (cm) Circumference (cm) 1 3 4. Conclusion Questions: 1. What is the mathematical equation you use to find the circumference of a circle given the diameter? Rewrite the equation solving for . . Calculate slope. Show all work on the graph. Answer: What is the physical meaning of the slope of your graph? (i.e., what does the slope of this graph represent?) How close is your slope to the constant in the above equation from question number 1? (calculate the percent error)

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