Circumference - MRS. CAHALL 7TH GRADE



Inquiry: How is the circumference of a circle related to its diameter?Step 1: Use the string at your table to measure the circumference of each circular item. Wrap the string around the item, and then open up the string and measure the piece of string using the centimeter side of the ruler. Name each item and record the measurements in the table below.Step 2: Measure the diameter of each item (do the best you can to go across the center). Record this measurement in the table.ObjectCircumference (C)Diameter (d)cdStep 3: Use a calculator to find the ratio of the circumference to the diameter of each of your items. Round each answer to the nearest hundredth. Work with your table to answer the following questions:1. Describe the ratio cd for the values you calculated.2. What happens when you multiply the diameter by the ratio c/d for each item? 3. What is the fancy name (symbol) for the ratio of c/d ?4. Write a formula for finding circumference:5. The radius of a circle is one half of its diameter. Write a formula that relates the circumference of a circle to its radius r.circumferencediameter=Formula for Circumference (with diameter)Formula for Circumference (with radius) ................
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