Because it is a mathematical concept and because it does not change; whether it is defined as the ratio of the circumference to diameter of a circle or as the limiting value of a large number of infinite sequences, or in a number of other ways.
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The ratio of the circumference of a circle to its diameter is a constant, irrespective of the actual measurements. This ratio is called pi and is 3.1415...
"Pi divided by 2" is a number, i.e. a constant. The derivative is the rate of change. The derivative of any constant is zero, because a constant never changes.
The decimal representation of pi is an irrational number, meaning it cannot be expressed exactly as a finite decimal or fraction. However, it is commonly approximated as 3.14159. Pi is defined as the ratio of a circle's circumference to its diameter and has infinite, non-repeating decimal digits. Mathematicians and scientists often use the symbol π to represent this fundamental mathematical constant.
pi2r can be calculated, but is has no particular mathematical interpretation.
Yes--in that it is a constant that typically precedes a variable.