Geometry

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