1.

Distance Formula for co-ordinates:

Answer»

(a) The distance d between any two points say P(x1, y1) and Q(x2, y2) is given by:

d = \(\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\)

⇒ d2 = (x2 – x1)2 + (y2 – y1)2 ⇒ d = ±\(\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\)

(b) The distance of a point P(x1, y1) form the origin

\(\sqrt{(x_2-0)^2+(y_2-0)^2}\) = \(\sqrt{x^2_1+y^2_1}\)



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