Geometry Crossword Puzzle

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Across
  1. 3. A figure with four equal sides
  2. 6. The total length of a figures boundary
  3. 8. Two objects that are the same in shape or is a mirror of a shape.
  4. 10. An angle that is less than 90 degrees
  5. 11. A six-sided Polygon
  6. 12. A figure that is formed by a ray or a line that shares a common endpoint
  7. 13. A quadrilateral with two pairs of parallel sides
  8. 15. Lines that go in the same direction but don’t intersect or touch
  9. 17. A triangle that has two equal sides and angles
  10. 18. An angle more than 90 degrees and less than 180 degrees
  11. 19. A figure with four sides
  12. 20. The amount of space in a two-dimensional figure
Down
  1. 1. The distance around the boundary of a circle
  2. 2. A triangle that has all sides equal in length
  3. 4. a one dimensional figure with just length no width
  4. 5. Reasoning using facts or axioms
  5. 7. An example that disproves a theory or proposition
  6. 9. Reasoning using opinions or observations
  7. 13. Two lines that meet or intersect at right angles
  8. 14. A quadrilateral whose opposite sides are equal and parallel
  9. 16. An angle that is exactly 90 degrees