By using the distance formula:

d² = (x₂ - x₁)² + (y₂ - y₁)²

Lets calculate the distance between the points (x₁, y₁) and (x₂ , y₂)

We have;

x₁ = 0, x₂ = 0

y₁ = 6, y₂ = - 2

d² = (0 – 0)² + ( - 2 – 6)²

d = √64

d = 8 units

So, the distance between A (0, 6) and B (0, 2) = 8