Across
- 2. three-horned dinosaur
- 3. three-sided shape
- 5. group of three
- 7. three times
- 9. three-wheeled bike
- 11. three-sport race
- 13. three-part arm muscle
- 15. every three years
Down
- 1. one thousand billion
- 3. three identical copies
- 4. three-coloured flag
- 6. three-pronged spear
- 8. three-winged airplane
- 9. three-cornered hat
- 10. shaped like a triangle
- 12. three-part series
- 14. one of three siblings
- 15. three-legged stand