TRIHEDRAL is validvalid

a solid having three sides or faces; thus, a trihedral angle is a solid angle bounded by three plane angles

117,374 of 196,601 in NWL2023·also valid in CSW24

a solid having three sides or faces; thus, a trihedral angle is a solid angle bounded by three plane angles

255,149 of 280,887 in CSW24·also valid in NWL2023

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