geometry

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Across
  1. 2. The tapered, sharpened end of a tool
  2. 3. an angle of 180 degrees
  3. 4. the space between two intersecting lines
  4. 7. at an angle of 90° to a given lines
  5. 11. a portion cut off by a line
  6. 12. lines that don't intersect
  7. 13. a tools that gives a certain position of a point or line
  8. 15. lines that cross at certain points
Down
  1. 1. an angle of 90 degrees
  2. 5. a one dimensional object with length but no width
  3. 6. the exact middle point
  4. 7. an instrument for measuring angles
  5. 8. any of a set of straight lines passing through one point
  6. 9. a unit of measurement of angles
  7. 10. the highest point, the top or apex
  8. 14. a flat surface on which a straight line joining