MeasureBased Functions: The Pi Constant 

The letter п, also written as Pi, is a constant number used in various mathematical calculations. Its approximate value is 3.1415926535897932. The calculator of Windows represents it as 3.1415926535897932384626433832795. Borland had included its value in the math.h library as M_PI 3.14159265358979323846. A diameter is two times the radius. In geometry, it is written as 2R. In C++, it is written as 2 * R or R * 2 (because the multiplication is symmetric). The circumference of a circle is calculated by multiplying the diameter to Pi, which is 2Rп, or 2 * R * п or 2 * R * Pi. A radian is 2Rп/R radians or 2Rп/R rad, which is the same as 2п rad or 2 * Pi rad. To perform conversions between the degree and the radian, you can use the formula: 360˚ = 2п rad which is equivalent to 1 rad = 360˚ / 2п = 57.3˚ 
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