Across
- 2. Formed by an intersection between two disks of the same radius
- 5. Has an outer atmosphere containing 3.25% helium by volume
- 7. Is composed of 20 intersecting triangular faces, having five triangles meeting at each vertex in a pentagrammic sequence
- 8. The lightest element in group 15 of the periodic table
- 9. = 2.71828
- 10. Radiation present in sunlight
Down
- 1. A polyhedron that has regular polygons as faces and is vertex-transitive
- 3. What cot stands for
- 4. A sentence containing every letter in the language
- 6. A polygon containing 1 billion sides
- 11. Has a dominant wavelength of approximately 625–740 nanometres