Geometry

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