Geometry

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Across
  1. 1. the space between two lines or planes that intersect
  2. 3. angle An angle less than 90 degrees but more than 0 degrees
  3. 6. of equal importance, rank, or degree
  4. 8. in or near an inner area
  5. 9. the length of the closed curve of a circle
  6. 12. corresponding in character or kind
  7. 13. lying in the same plane
Down
  1. 1. elevation above sea level or above the earth's surface
  2. 2. a plane curve with every point equidistant from the center
  3. 4. an area that is in the middle of some larger region
  4. 5. angle two angles whose sum is a right angle
  5. 7. a continuous portion of a circle
  6. 10. a shape with a circular base and sides tapering to a point
  7. 11. Triangle a triangle whose interior angles are all acute
  8. 13. a combination of three or more notes that blend harmoniously