Language of geometry

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Across
  1. 1. Point exactly halfway between two endpoints
  2. 6. Two lines that meet at a 90-degree angle
  3. 9. Flat straight tool to measure lengths
  4. 11. Lines that never meet, no matter how far extended
  5. 12. Exactly 90 degrees
  6. 14. Part of a line with two endpoints
  7. 15. Formed where two lines meet
  8. 16. starts at one point and goes on forever in one direction
Down
  1. 2. divide by passing through or across
  2. 3. Measures exactly 180 degrees
  3. 4. Unit for measuring angles
  4. 5. Straight and infinite in both directions
  5. 7. A location in space with no size or shape
  6. 8. Flat surface extending infinitely in all directions
  7. 10. Extends infinitely in both directions
  8. 11. Tool used to measure angles
  9. 13. The point where two lines or edges meet