Assertion: tetrahedron's base | /r/HasProperty | equilateral triangle
Facets:
Source sentences:
text: A right tetrahedron is so called when the base of a tetrahedron is an equilateral triangle and other triangular faces are isosceles triangles.
text: If the base of a tetrahedron is an equilateral triangle and the other triangular faces are isosceles triangles then it is called a right tetrahedron.