Points P (x1, y1) and Q(x2, y2)
(i) When PQ is parallel to y axis then x1 = x2
So, the distance between P and Q is given by
\( \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\)
= \(\sqrt{ (y_2-y_1)^2}\)
= |y2 – y1|
(ii) When PQ is parallel to the x-axis then y1 = y2
So, the distance between P and Q is given by =
\( \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\)
= \(\sqrt{ (x_2-x_1)^2}\)
= |x2 – x1|
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