Geometry terms

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Across
  1. 3. polygon with three edges
  2. 4. middle point of a line segment
  3. 6. divide into two parts.
  4. 8. Four 90 degree angles
  5. 11. mirror image
  6. 12. What Mr.G teaches
  7. 14. a vertex
Down
  1. 1. Intersecting a system of lines
  2. 2. a fixed location
  3. 5. 3 sides
  4. 7. equal sides
  5. 8. not congruent but...
  6. 9. A fixed location
  7. 10. a fact or a rule written with math symbols
  8. 13. a branch of mathematics