geometry crossword puzzle

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Across
  1. 4. the steepness of a line
  2. 7. the point where two lines meet to form a corner
  3. 8. a tiny dot that marks a specific location
  4. 9. measures less than 90 degrees
  5. 10. lines two straight lines that are always the same distance apart and never intersect
  6. 11. the space between two straight lines that meet at a point
  7. 14. they're like twins in the world of shapes
  8. 15. three sides are the same length.
  9. 16. determine the dimensions
  10. 17. the length of the closed curve of a circle
  11. 19. the property created by the space between two objects
  12. 20. exactly 90 degrees
Down
  1. 1. more than 90 degrees
  2. 2. two sides of the triangle have equal length
  3. 3. two angles whose sum is a right angle
  4. 5. relation with respect to comparative quantity or magnitude
  5. 6. lines
  6. 12. a piece of a line with two endpoints
  7. 13. a branch of mathematics that deals with shapes, sizes, angles and dimensions of objects.
  8. 18. an area that is in the middle of some larger region