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Tetrahedron
/tˌɛtɹɐhˈiːdɹən/
/ˌtɛtɹəˈhidɹən/
[noun]
Tetrahedron
[NOUN]
1
(geometry) a polyhedron with four flat sides; a triangular pyramid
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Examples
1.
And
a
tetrahedron
has
perfect
symmetry
.
2.
The
tetrahedron
has
a
dihedral
angle
of
70
and
a
half
degrees
.
3.
As a matter of fact
,
this
thing
has
600
tetrahedra
.
4.
You
take
two
tetrahedron
.
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