Basic Geometry

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Across
  1. 2. Compass opening
  2. 5. Half diameter
  3. 8. Measure of a surface
  4. 9. Measures an angle
  5. 11. Set of books written by a famous greek mathematician
  6. 12. Greek mathematician
  7. 13. Equidistant from each endpoints
Down
  1. 1. Longest chord of a circle
  2. 3. French mathematician
  3. 4. Angle formed by a pair of perpencidular lines
  4. 6. Set of points equidistant from a center
  5. 7. Nothing in common
  6. 10. Earth measure
  7. 11. On a side of a segment line