\( O A B C \) is a regular tetrahedron of side unity, then
(a) the ... VIDEO
\( O A B C \) is a regular tetrahedron of side unity, then
(a) the length of perpendicular from one vertex to opposite
\( \mathrm{P} \) face is \( \sqrt{2 / 3} \)
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(b) the perpendicular distance from mid-point of \( \overline{O A} \) to the plane \( A B C \) is \( 1 / \sqrt{6} \)
(c) the angle between two skew edges is \( \pi / 2 \)
(d) the distance of centroid of the tetrahedron form any vertex is \( \sqrt{3 / 8} \)
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