Find the distance between `P(x_1,y_1)`and `Q(x_2,y_2)`when:
(i) `P Q`is parallel to the yaxis,
(ii) `PQ` is parallel to the x-axis.

Explanation

To find the distance between points \( P(x_1, y_1) \) and \( Q(x_2, y_2) \) in two cases, we can follow these steps:

### Case (i): When \( PQ \) is parallel to the y-axis

1. **Identify the coordinates**: The coordinates of point \( P \) are \( (x_1, y_1) \) and the coordinates of point \( Q \) are \( (x_2, y_2) \).

2. **Understand the condition**: If \( PQ \) is parallel to the y-axis, the x-coordinates of both points must be the same. Therefore, we have:
\[
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