| Answer | Crossword Clue |
|---|---|
| dihedral | the angle between two planes, also DIEDRAL |
| diedrals | DIEDRAL, the angle between two planes, also DIHEDRAL |
| dihedrals | DIHEDRAL, the angle between two planes, also DIEDRAL |
| diedral | the angle between two planes, also DIHEDRAL |
| dihedrals | A place where two planes of rock meet at an angle of between 60░ and 120░ |
| frusta | the part of a solid, as a cone or pyramid, between two usually parallel cutting planes |
| frustum | the part of a solid, as a cone or pyramid, between two usually parallel cutting planes |
| frustums | The portion of a cone or pyramid that remains after its upper part has been cut off by a plane parallel to its base, or that is intercepted between two such planes |
