What is the ratio of a circle of radius 3 units? How about with radius 7 units? What about radius 2.34 units?

After exploring this ratio we can conclude that:

**All circles have r = 4*pi = 12.56**

How does this come about?

- The perimeter of a circle is circumference of 2*(pi)*radius.
- Perimeter squared is....4*(pi^2) * radius^2
- Area is pi * radius^2
- So the ratio=4*pi after cancelling.
- Do it yourself and see why.....