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Tetrahedron

British pronunciation/tˌɛtɹɐhˈiːdɹən/
American pronunciation/ˌtɛtɹəˈhidɹən/
Tetrahedron
[NOUN]
1

(geometry) a polyhedron with four flat sides; a triangular pyramid

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tetrahedron definition and meaning
Examples
1And a tetrahedron has perfect symmetry.
2The tetrahedron has a dihedral angle of 70 and a half degrees.
3As a matter of fact, this thing has 600 tetrahedra.
4You take two tetrahedron.
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