(i) 1/√2

we know that √2 = 1.414..., which is an irrational number .

We can conclude that, when 1 is divided by √2 we will get an irrational number. Therefore, we conclude that 1/√2 is an irrational number.

(ii) 2π

We know that π = 3.1415...., which is an irrational number.

We can conclude that 2π will also be an irrational number.

Therefore, we conclude that 2π is an irrational number.