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The circumference is the distance around the circle. The circumference of the Ferris wheel is the distance that Nila and Jason will travel when they make a trip around it. A diameter is a line segment (with a length) that connects two points on a circle and passes through the center. The phrase “the diameter of a circle” means the length of any diameter.
The circumference and the diameter of a circle can be measured in many ways.
- Tell some ways that you might measure the circumference of a circle. For example, how can you measure the circumference of a clock face or a can lid?
- Tell some ways that you could measure the diameter of a circle.
- Use two pieces of string to measure the diameter and circumference of objects shaped like circles such as lids or cans. Explore the relationship between the circumference and the diameter of a circle. What do you notice?
- Estimate the number of diameters that will fit around the same circle.
- Estimate the circumference of the Ferris wheel at Navy Pier. (Hint: Remember the diameter is 150 feet.)