Math : Finding the Approximate of π

Here it is, my first post about Math.
On 27th August 2012,   we were having an activity on finding the value of π from the known circumference and a 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. 

Related word to circle :

arc: a curved line that is part of the circumference of a circle

chord: a line segment within a circle that touches 2 points on the circle.

circumference: the distance around the circle.

diameter: the longest distance from one end of a circle to the other.

pi (pi): A number, 3.141592…, equal to (the circumference) / (the diameter) of any circle.

radius: distance from center of circle to any point on it.

sector: is like a slice of pie (a circle wedge).

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.

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