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Pi ( Ï) is the ratio between the radius of a circle and its circumfrance. The value allows calculation of the area and circumfrance of a circle and the volume of a sphere. Pi is the number used to find the circumference or area of a circle. It is also used to calculate the surface area and volume of a sphere, cylinder, and cone. <br /> It can be shortened as 3.14 <br /> Numerically it is 3.1415 then a long string of numbers that never end as it is an irrational number.
Pi began being symbolized by the pi symbol (Ï) in the 1706 by the British mathematician William Jones. Jones used 3.14159 as the calculation for pi. Pi r squared. In basic mathematics, pi is used to find area and circumference of a circle.Pi is used to find area by multiplying the radius squared times pi, or. So in trying to find the area of a circle with a radius of 3 centimeters, Ï3 2 = 28.27 cm.y definition, pi is the ratio of the circumference of a circle to its diameter. In other words, pi equals the circumference divided by the diameter (Ï = c/d). Conversely, the circumference is equal to pi times the diameter (c = Ïd).