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square on two ends and the other sides have rectangles. Tetra means four, and four of the faces are the same. All right angles.
Ortho means right angles. Orthodontists put teeth at right angles. All rectangles. No squares.
Angles are not square. Parallelogram on pair of faces, other sides rectangles. One pair of parallelograms. In picture back and front are parallelograms.
Face-Centered unit cell
A cubic unit cell with an atom in the middle of each face. Picture dice with a one on each side.
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