| Answer | Crossword Clue |
|---|---|
| tetrahedra | A solid having four plane triangular faces; a triangular pyramid |
| tetrahedron | A solid having four plane triangular faces; a triangular pyramid |
| tetrahedrons | A solid having four plane triangular faces; a triangular pyramid |
| octahedrons | A three-dimensional shape having eight plane faces, esp. a regular solid figure with eight equal triangular faces |
| icosahedra | A solid figure with twenty plane faces, esp. equilateral triangular ones |
| icosahedrons | A solid figure with twenty plane faces, esp. equilateral triangular ones |
