geometry

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Across
  1. 2. the length of the closed curve of a circle
  2. 4. a continuous portion of a circle
  3. 6. a surface generated by rotating a line around a fixed line
  4. 8. triangle a three-sided regular polygon
  5. 11. triangle a triangle whose interior angles are all acute
  6. 12. a round three-dimensional closed surface
  7. 14. a four-sided polygon
Down
  1. 1. triangle a triangle with two equal sides
  2. 3. angles two angles whose sum is a right angle
  3. 4. elevation above sea level or above the earth's surface
  4. 5. in or near an inner area
  5. 7. a quantity obtained by the addition of a group of numbers
  6. 9. angle an angle less than 90 degrees but more than 0 degrees
  7. 10. combination of three or more notes that blend harmoniously
  8. 13. a straight line from the center to the perimeter of a circle