Assertion: tetrahedron's volume | /r/HasProperty | one third of the base area
Facets:
Source sentences:
text: We can calculate its volume using a well known formula: The volume of a pyramid is one third of the base area times the perpendicular height.
text: Then the volume of two pyramids (using the formula of the volume of a pyramid: one third of the base area times the height) is one third of the volume of the cube.
text: Therefore, the volume of an octahedron of edge length 1 is (remember that the volume of a pyramid is one third of the base area times the perpendicular height):