Changes

The value of <big><math>\pi</math></big> is approximately 3.14159 in decimal. This value is precise enough for almost all ordinary purposes; it can, for example, be used to calculate the circumference of the Earth with an error of only about 110 feet.  

The value of <big><math>\pi</math></big> is approximately 3.14159 in decimal. This value is precise enough for almost all ordinary purposes; it can, for example, be used to calculate the circumference of the Earth with an error of only about 110 feet.  

For rough purposes, the fraction 22/7 (= 3.14285...) is sometimes used while 355/113 (=3.1415929...) is accurate to six places.

For rough purposes, the fraction 22/7 (= 3.14285...) is sometimes used while 355/113 (=3.1415926...) is accurate to six places.

In hexadecimal (base-16) notation, <big><math>\pi</math></big> is approximately 3.243f.

In hexadecimal (base-16) notation, <big><math>\pi</math></big> is approximately 3.243f.