Mathematics · Geometry
Four equilateral triangles are used to form a regular closed three-dimensional object (a regular tetrahedron) by joining them along their edges. What is the dihedral angle between any two adjacent faces?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 145°
- 260°
- 390°
- 4cos-1(13) ≈ 70.53°✓
Correct answer
cos-1(13) ≈ 70.53°
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