# Circumference and Diameter

- Author:
- Anthony Dove

- Topic:
- Geometry

The purpose of this app is to examine the relationship between the diameter and circumference of a circle.

- The diameter slider changes the diameter of the circle
- "Roll the Circle" will unroll the circumference of the circle into a segment as it is slid to the right.
- Once unrolled, use the checkbox to see the full segment of the circumference, the length of the diameter, and the measure of the circumference.

- Use diameter = 1.5. How many diameters are created when the circumference is unrolled?
- Use diameter = 2. How many diameters are created when the circumference is unrolled?
- Use diameter = 4. How many diameters are created when the circumference is unrolled?
- Try your own diameter measure. How many diameters are created when the circumference is unrolled?
- Examine your 4 responses. What relationship would you say exists between the measurements of the diameter and circumference of a circle?
- Google the circumference of a circle. How does this relate to what you determined in this app?