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Yes, any positive number is a number that doesn't have a (-) behind it (-20; -23.67; -45.45454...), and is not zero (0).

Any repeating number (see 3rd negative example) is irrational, no matter what its sign. Irrational Numbers also include numbers (decimals, specifically) that don't repeat, but don't stop. Numbers that don't terminate include pi.

Pi, as it is, is proof of a positive irrational number.

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