Answer:
is an irrational number.
Explanation:

When we find the decimal expansion of
, we find that it is non terminating. In other words we can say that the expansion does not stop or cease to end.
Thus, it can be said
cannot be written in the form, of a fraction
.
Thus,
is an irrational number.
Thus,
is an irrational number lies in the subset of irrationa numbers.