It is irrational because 16*pi can't be expressed as an exact fraction
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No. Pie is potentially never ending. This makes it an irrational number.
6.5 is a rational number because it can be expressed as a fraction
What is 'pie' ; the meat pie that you eat??? I think you mean 'pi' , the mathematical symbol. Please spell it correctly.!!!!! pi = 3.141592654.... is an irrational number. Casually, an IRRATIONAL number is one which the decimals go to infinity and the decimal digits are not in any regular order. Any number rattional or irrational multiplied to aN IRRATIONAL number produces an irrational result. Hen ce -9 is rational -9(3.141592654...) = -28.27433388... is irrational.
4.6 is rational.
(pi) itself is an irrational number. The only multiples of it that can be rational are (pi) x (a rational number/pi) .