Mathegoras

Solid geometry › Polyhedra and sections › Angles in pyramids

Angle between faces of an equifacial tetrahedron

University · ●●●●○ 100 pts

Let ABCDABCD be a tetrahedron in which opposite edges are equal. The angle between planes ABDABD and BCDBCD is 90∘90^\circ, and the angle between planes BCDBCD and CADCAD is 60∘60^\circ. Find the angle between planes CADCAD and ABDABD in degrees.

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regular tetrahedrondihedral angle