# Circumference and Diameter of a Circle

- Author:
- marcien.dentey, Terry Lee Lindenmuth

## Investigating Pi

## Relation between the circumference and diameter of a circle

Based on the values in the last column of your spreadsheet, what can you conclude about the ratio of the circumference of a circle to its diameter, ?

## The ratio C/d

Which of the following mathematical constants does the ratio remind you of?

## Find the Circumference

The ratio for a certain circle is found to be approximately 3.14. What is the circumference of this circle it it has a radius of 5 cm?