A regular tetrahedron has six edges of length a. (a) Show that two opposite edges, such
Chapter 3, Problem 3.62(choose chapter or problem)
A regular tetrahedron has six edges of length a. (a) Show that two opposite edges, such as OA and BC, are perpendicular to each other. (b) Use this property and the result obtained in 3.61 to determine the perpendicular distance between edges OA and BC.
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