3D model · 4 faces · 10 mm circumsphere
The simplest solid that encloses a volume: four equilateral triangles, meeting three at each of four vertices. It is the only Platonic solid that is its own dual: join the centres of its four faces and you get a second tetrahedron.
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The simplest solid that encloses a volume: four equilateral triangles, meeting three at each of four vertices. It is the only Platonic solid that is its own dual: join the centres of its four faces and you get a second tetrahedron.
Sphalerite and tetrahedrite grow as tetrahedra, which is where tetrahedrite gets its name. Of the five solids it fills the least of its own circumsphere.
Taken from the delivered model and checked against its mesh every time this page is built.
Six formats: STEP (the exact solid for CAD), 3DM for Rhino, STL and OBJ meshes, FBX for Blender, 3ds Max, Maya, Cinema 4D, Unity and Unreal, and GLB for the web and AR. All are in millimetres at real-world scale, with 4 flat faces.
No. The Platonic solids are sold as 3D models only, with no faceting design, tier table or diagram.
It measures 8.165 x 7.071 x 6.667 mm resting on a face, with every vertex on a sphere 10 mm across. All five Platonic solids share that sphere, so they nest and sit together at true relative size. Scale it uniformly to any size: for a 10 mm edge, scale by 1.2247.
Y up, with one face resting on the ground plane and the centroid on the Y axis. The midpoint of one edge of the resting face lies on the +X axis, which keeps the cube square to the axes.
Yes. The mesh is watertight and manifold, with outward normals and no duplicate vertices, so it prints and casts without repair. Use the STEP file when you need the exact solid in CAD.
The tetrahedron as exact geometry: 4 flat faces, real-world scale, ready for CAD, rendering, printing and casting. The Platonic solids are sold as 3D files only.
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