On Monday, 27th August 2012, we did an activity on finding the approximate value of π from the known circumference and diameter of a circle.
A circle is a set of points that are equidistant from the center point O. The distance r from the center is called the radius, and. Twice the radius is known as the diameter d = 2 r.
Because we know that π is a the ratio of the circumference to the diameter of a circle, we did this activity on finding the π, by finding the circumference of an object using a string, and find the diameter using a ruler.
Here is the result of our findings:
We have known that π = 22/7, before we did this activity. And from the result of this activity, we found out π, which is the ratio of circumference and the diameter, are close to 22/7.
Source : Edita’s Blog
The advantage of knowing all about circle can make our daily activities easy. For example, making VCD, we need to measure it so that it would fit in the VCD player or to measure how many rotation does tire do in certain distance, that’s why its important to know the area and the circumference of circle.