If the co-ordinates of the points P and Q be (1, -2, 1) and (2, 3, 4) and O be the origin, then
If the co-ordinates of the points P and Q be (1, –2, 1) and (2, 3, 4) and O be the origin, then
The co-ordinates of two points P and Q are (x1,y1) and (x2,y2) and O is the origin. If circles be described on OP and OQ as diameters then length of their common chord is