geometry

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