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Learning Target: Use stratagies to develop formulas to find the circumfrence.

What We Did: Each table was given five round items and we found the circumfrence and diameter of each of the items. When we divided the circumfrence by the diameter, our products were close to 3.14. That meant if you multiply the diameter by 3.14, or pi, you get the the circumfrence. Also, if you know the radious, then you can multiply that times four to get the circumfrence.

Example Problem: If the diameter is 4 inches, then you'd multiply it by 3.14, or pi.

3.14

x 4

12.56

For more information, visit these websites:

Circumference diagrams and explanations 

Mrs. Glosser's Math Goodies

Calculating the circumference of a circle