Geometry

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Across
  1. 5. a single thing used for measuring
  2. 6. an angle smaller than ninety
  3. 8. things which are the same
  4. 9. a shape like a square except all the sides are not equal
  5. 11. an angle equal to ninety
  6. 13. a polygon with five sides
  7. 14. congruent figures dilated
  8. 15. a shape with ten sides
  9. 19. the distance across a circle
  10. 20. how tall something is
  11. 21. an angle greater than ninety
Down
  1. 1. the total space something takes up (3D)
  2. 2. the name of a 180° angle
  3. 3. a shape with all equal sides and all 90° angles
  4. 4. the distance around a circle
  5. 6. the total space something covers (2D)
  6. 7. a polygon with one set of parallel sides
  7. 10. the face of which a figure is built upon
  8. 12. a polygon with three sides
  9. 16. a round, 2D shape
  10. 17. how long something is
  11. 18. the distance from the center of a circle to the outside