Across
- 1. Circular, coloured part of the eye
- 4. The curved path a planet takes
- 7. Round form of currency
- 8. Victorian bike with one large wheel
- 10. A large Roman amphitheatre
- 11. Rings inside the trunk of a tree can be used to find out the tree's ...
- 12. The inventors of geometry
Down
- 2. The most famous stone circle site
- 3. Name of spikes on chariot wheels
- 5. Leaning tower with circular cross section
- 6. Was first invented make pottery
- 9. Was believed to be flat until the 5th century BC