Geometry

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Across
  1. 1. an exact position or location on a plane surface
  2. 3. sides lie in opposite directions
  3. 5. When two or more lines cross
  4. 10. sticks that indicate measurement
  5. 11. measurement of a plane angle
  6. 12. an angle of 90°
  7. 13. Lines that are at right angles (90°)
Down
  1. 1. lines that do not intersect
  2. 2. each angular point of a polygon
  3. 4. is the middle point of a line segment
  4. 6. a vector from a point to a point . Half infinite
  5. 7. an instrument for measuring angles
  6. 8. line that is bounded by two distinct end points
  7. 9. the figure formed by two rays
  8. 14. a flat, two-dimensional surface
  9. 15. an interval between two points