Geometry

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Across
  1. 1. a continuous portion of a circle
  2. 4. lying in the same plane
  3. 7. an angle less than 90 degrees but more than 0 degrees
  4. 9. corresponding in character or kind
  5. 12. two angles whos sum is a right angle
  6. 15. a three-sided regular polygon
Down
  1. 2. a plane curve with every point equidistant from the center
  2. 3. the length of the closed curve of a circle
  3. 5. the space between two lines or planes that intersect
  4. 6. extending or lying across
  5. 8. in or near an inner area
  6. 10. of equal importance, rank or degree
  7. 11. an area that is in the middle of some larger region
  8. 13. elevation about sea level or above the earths surface
  9. 14. written on or in a surface