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Distance Formula

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(i) Distance between two points P (x1, y1) and Q (x2, y2), is

√(x2 – x1)

2

+ (y2 – y1)

2

.

(ii) If points are (r1 , θ1) arid (r2, θ2), then distance between them is

√r2

1 + r2

2 – 2r1r2cos(θ1 – θ2).

(iii) Distance of a point (x1, y1) from the origin is √x2

1 + y2

1.

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