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Find the distance between P(x-1,\ y1)a n...

Find the distance between `P(x-1,\ y_1)a n d\ Q(x_2, y_2)` when i. `P Q` is parallel to the y-axis ii. PQ is parallel to the x-axis.

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The given points are `P (x₁, y₁) and Q (x₂, y₂)`
(i) When `PQ` is parallel to the y-axis, `x₁ = x₂.`
In this case, distance between or P and Q `= √(x₂ - x₁)² + (y₂ - y₁)²`
`PQ = √(y₂ - y₁)²`
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