Geometry Puzzle

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Across
  1. 3. a quantity obtained by the addition of a group of numbers
  2. 7. determine the dimensions of something or somebody
  3. 8. the quality of being alike
  4. 9. corresponding in character or kind
  5. 11. the property created by the space between two objects
  6. 12. a line enclosing a plane area
  7. 13. the space between two lines or planes that intersect
  8. 14. being essentially comparable to something
Down
  1. 1. a straight line from the center to the perimeter of a circle
  2. 2. the length of the closed curve of a circle
  3. 4. relating to or situated in or extending toward the middle
  4. 5. of equal importance, rank, or degree
  5. 6. the length of a straight line through the center of a circle
  6. 10. being everywhere equidistant and not intersecting