Question
Classify the number as rational or irrational: $2\pi$
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Answer
$\because 2$ is a rational number and $\pi$ is an irrational number.
$(\because$ The product of a non-zero rational number with an irrational number is irrational$)$
$\therefore 2 \pi$ is an irrational number.
$(\because$ The product of a non-zero rational number with an irrational number is irrational$)$
$\therefore 2 \pi$ is an irrational number.
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