A rational number is a number that can be expressed as a fraction \(\frac{p}{q}\) where \(p\) and \(q\) are integers and \(q \neq 0\).
Let's analyze the options:
- \(2\pi\): This is an irrational number, as \(\pi\) itself is irrational.
- \(60\): This is a rational number since it can be expressed as \(\frac{60}{1}\).
- \(\sqrt{61}\): This is also an irrational number because 61 is not a perfect square.
- \(0.37815\): This is a terminating decimal, which can be expressed as \(\frac{37815}{100000}\), hence it is also a rational number.
So, the rational numbers from the given options are 60 and 0.37815.
If you need just one rational number, the most straightforward choice would be 60.