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Three Dimensional Geometry | Angle between two lines

If the angle between two lines whose d.rs are 1, 2, p − 1 and -3, 1, 2 is 90°, then p is
An angle which is greater than 180° but less than 360° is called
One of the vertices of a square is the origin and the adjacent sides of the square are coincident with the negative x-axis. If a side is 3 then which pair will not be its vertex.
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