Across
- 3. Two angles forming a straight line.
- 6. A fact proven by reasoning.
- 7. Result of addition.
- 8. A flat surface with no edges.
- 9. A quadrilateral with two pairs of equal adjacent sides.
- 11. Distance from polygon center to a side.
- 13. Triangle’s balance point.
- 14. Angle measuring 90 degrees.
- 16. Line that cuts across others.
- 18. A straight path that goes on forever in both directions.
Down
- 1. Height of a triangle.
- 2. Space inside a shape.
- 4. A rule accepted without proof
- 5. A statement proven true.
- 8. An exact location in space.
- 10. Middle of a line segment.
- 12. Ten-sided polygon.
- 15. Connects a vertex to the midpoint of the opposite side.
- 17. A line with one endpoint
- 19. Opposite of a statement.