A tetrahedron and a trigonal pyramid have distinct geometric and bond-angle differences
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SUPPORTED
the evidence backs this
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While mathematically equivalent as triangular pyramids, in chemistry, a tetrahedron and a trigonal pyramid describe distinct molecular geometries with different atom arrangements, hybridizations, and bond angles.
Evidence for · 3
chemistry.stackexchange.com: What's the difference between a tetrahedron and a trigonal pyramid?
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Notes that while identical geometrically, they differ in chemical and colloquial usage as molecular descriptors.
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en.wikipedia.org: Tetrahedral molecular geometry
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Details tetrahedral molecular geometry with uniform bond angles of approximately 109.5°.