It is felt that the creation of the Circle is not created by the man himself but came through the inspiration of Nature itself. The shape of Sun, Full Moon, Eyes are some examples for it.
Some basic things :
There are 3 major parts to remember.
Radius : The straight line drawn to the Circumference of the Circle from the Centre point.
Diameter : Diameter is the straight line drawn from one point of the circumference to another point of the circumference through the center point (Origin) .
Circumference:
Circumference is the curved line drawn from the origin of the Circle having equal radii.
It is evident that so many people from ancient period tried to understand the nature of a Circle.
They found the relationship between the Circumference and radius of the Circle.
Circumference increases with the increase in Radius or Diameter
Pi is the ratio of Circumference of the Circle to its Diameter .
The value of Pi (Its value is Constant) is very essential factor to know the Area of a Circle.
Finding the Value of Pi is not a simple thing because the measurement of the Circumference is not so easy.
So many people tried to know the value of Pi by different mathematical methods.
It is believed that the Egyptians and Babylonians were the first persons to estimate the value of pi during the period 2000 B.C.
The Babylonians estimated its value as 3+1/8 = 3.125 while Egyptians were calculated it as 3.16045
During the period 1200 B.C. Chinese estimated its value as 3. In the Bible it is written “....and he made molten Sea, Ten cubits from the one brim to the other; it was round all about, and his height was five cubits: and a line of thirty cubits did compass it about.” This states that the value of Pi is approximately 3.
Archimedes was the great mathematician lived during 287-212