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The co-ordinates of two points P and Q a...

The co-ordinates of two points P and Q are `(x_1,y_1)` and `(x_2,y_2)` and O is the origin. If circles be described on OP and OQ as diameters then length of their common chord is

A

`|x_1y_2+x_2y_1|/(PQ)`

B

`|x_1y_2-x_2y_1|/(PQ)`

C

`|x_1x_2+y_1y_2|/(PQ)`

D

`|x_1x_2+y_1y_2|/(PQ)`

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