Assertion: tetrahedron's angle | /r/HasProperty | 6 0 ∘ 60^{\circ60∘
Facets:
Source sentences:
text: Since the interior angle of a regular triangle is 6 0 ∘ 60^{\circ} 60∘, there can only be 3 , 4 , 3, 4, 3,4, or 5 5 5 regular triangles meeting at a face ( ( (since 6 × 6 0 ∘