1.

OABC is a regular tetrahedron of side unity, then:

Answer»

The length of perpendicular from one vertex to opposite face is `SQRT((2)/(3))`
The perpendicular distance from mid-point of `vec(OA)` to the plane ABC is `(1)/(sqrt6)`
The angle between two skew EDGES is `pi/2`
The distance of centroid of the TETRAHEDRON from any vertex is `sqrt((3)/(8))`

ANSWER :A::B::C::D


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