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tetrahedron
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Tetrahedron
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In geometry, a solid figure (polyhedron) with four triangular faces; that is, a pyramid on a triangular base. A regular tetrahedron has equilateral triangles as its faces.
The volume (V) of a tetrahedron is given by
where B is the area of the base and h is the perpendicular height.
In chemistry and crystallography, tetrahedra describe the shapes of some molecules and crystals; for example, the carbon atoms in a crystal of diamond are arranged in space as a set of interconnected regular tetrahedra.
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arc
chord (geometry)
circle
circle theorem
circumference
cone (geometry)
congruent
cosine
cross-section
cube (geometry)
cuboid
cylinder (geometry)
elevation, angle of
geometry
hexagon
octagon
parallelogram
pentagon
polygon
prism (mathematics)
pyramid (geometry)
Pythagoras' theorem
quadrant
quadrilateral
radius (mathematics)
rectangle
rhombus
sector (mathematics)
similar
similar triangles
sine
sphere
square
tangent (circle)
tangent (trigonometry)
tetrahedron
three-dimensional
trapezium
triangle (geometry)
trigonometry
two-dimensional
chord (geometry)
circle
circle theorem
circumference
cone (geometry)
congruent
cosine
cross-section
cube (geometry)
cuboid
cylinder (geometry)
elevation, angle of
geometry
hexagon
octagon
parallelogram
pentagon
polygon
prism (mathematics)
pyramid (geometry)
Pythagoras' theorem
quadrant
quadrilateral
radius (mathematics)
rectangle
rhombus
sector (mathematics)
similar
similar triangles
sine
sphere
square
tangent (circle)
tangent (trigonometry)
tetrahedron
three-dimensional
trapezium
triangle (geometry)
trigonometry
two-dimensional
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