tetrahedra
Triangular-faced polyhedra plural
Tetrahedra is the plural of tetrahedron, a three-dimensional shape with four triangular faces.
The tetrahedron is the simplest polyhedron—a pyramid with a triangular base.
The crystal formed perfect tetrahedra.
The word appears in chemistry, crystallography, and geometry, where tetrahedral structures are fundamental.
Corner points of shapes
- edgesOuter limits or boundaries
- facesFront of heads
- triangularThree-cornered in form
- three-dimensionalHaving volume and depth
simplex · volume · surface area · equilateral · Euclidean · convex · regular · solid
Resistance to displacement
- rigidityState of being unbending
- frameworkUnderlying support system
- trussLoad-bearing beam arrangement
- latticeOpenwork of crossed strips
bonding · molecular · methane · silica · carbon · crystalline · diamond · architecture
Turning on an axis
- reflectionReturned light or thought
- axisRotation reference line
- invarianceQuality of staying unchanged
- congruenceState of agreement
isometry · transformation · orientation · chiral · achiral · mirror · permutation
Greek philosopher, academy founder
- EuclidFather of geometry
- fireCombustion with flames
- elementBasic substance or factor
- classicalOf ancient Greece/Rome
icosahedron · octahedron · dodecahedron · cube · ancient · philosophy · cosmos · perfect
vertices
Corner points of shapes
- edgesOuter limits or boundaries
- facesFront of heads
- triangularThree-cornered in form
three-dimensional · simplex · volume · surface area · equilateral · Euclidean · convex · regular · solid · centroid
stability
Resistance to displacement
- rigidityState of being unbending
- frameworkUnderlying support system
- trussLoad-bearing beam arrangement
lattice · bonding · molecular · methane · silica · carbon · crystalline · diamond · architecture · geodesic
rotation
Turning on an axis
- reflectionReturned light or thought
- axisRotation reference line
- invarianceQuality of staying unchanged
congruence · isometry · transformation · orientation · chiral · achiral · mirror · permutation
Plato
Greek philosopher, academy founder
classical · icosahedron · octahedron · dodecahedron · cube · ancient · philosophy · cosmos · perfect · ideal
tetrahedraspheres
Round solids, all points equidistant
ellipsoids · ovoids · tori · blobs