Across
- 3. a 8-sided polygon
- 4. a quadrilateral that has 2 pairs of equal length sides.
- 7. a line that has 2 points
- 10. the middle point of a segment
- 11. the perpendicular from the center of a regular polygon to one of the sides
- 13. the amount of space in a 2d shape
- 15. the opposite of an operation
- 17. formed when 2 lines intersect
- 19. rays with a common endpoint, extending in opposite ways
Down
- 1. a 9-sided polygon
- 2. perpendicular line segment from the vertex to the opposite side
- 3. where 3 altitudes of a triangle meet
- 5. a statement which is taken without proof
- 6. the boundary of a closed plane figure
- 8. the middle number in a list of numbers
- 9. two angles that have common sides and vertices but do not overlap
- 12. an angle greater than 90 degrees but less than 180 degrees
- 14. a five-sided polygon
- 16. a straight figure that has no thickness and extends endlessly
- 18. the figure formed by 2 rays meeting at a common endpoint