Geometry

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Across
  1. 3. the length of the closed curve of a circle
  2. 5. a surface generated by rotating a line around a fixed line
  3. 7. determine the dimensions of something or somebody
  4. 10. being essentially comparable to something
  5. 12. of equal importance, rank, or degree
  6. 13. a specific identifiable position in a continuum or series
Down
  1. 1. a plane curve with every point equidistant from the center
  2. 2. the length of a straight line through the center of a circle
  3. 4. an area that is in the middle of some larger region
  4. 5. a shape with a circular base and sides tapering to a point
  5. 6. corresponding in character in a kind
  6. 7. relating to or situated in or extending toward the middle
  7. 8. the space between two lines or planes that intersect
  8. 9. the property created by the space between two objects
  9. 11. lying in the same plane