Finding the Circumfrance

From the Table with Materials get yourself;

  • String
  • Three Circular Items
  • Ruler

 

Draw a Chart on the back of your Paper from Task 1 that is 5 X 4.

Label the Columns (Acrossed)

  • Object
  • Diameter
  • Circumference
  • Ratio (Circumfrance to Diameter written as a fraction)
  • Circumfrance by Formula

Part 1

Once you have made the chart follow the steps listed below;

  1. Measure the Diameter of each circular object to the nearest Millimeter.
  2. Find the Circumference of each object by wrapping a string around the outside of the circle. Then straighten the string and measure it's length to the nearest millimeter.
  3. Calculate the ratio of circumference to diameter to the nearest tenth (divide den. by num.)
  4. Write in complete sentences what you notice about the relationship between the circumfrance of the object and it's diameter.

Part 2

  1. Next using the same objects & info. from the chart above, complete the following calculations.
  2. For each object use the diameter you measured above and plug it into the formula you have written on your paper to find the objects circumfrance using Pi. Write this Calculation in the appropriate column on your chart.
  3. Compare these calculations to those in the column you measured using the string. Do they Match? Why or why not.

Move on to Task 3

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