Graphic communications

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Across
  1. 1. a polygon with 8 sides and angles
  2. 3. the language of industry
  3. 6. drawing 45 degree drawing
  4. 9. half a diameter
  5. 11. when lines meet at a 90 degree angle
  6. 12. a triangle with all even sides
  7. 13. something you can measure
Down
  1. 2. a method of projection
  2. 4. 30 degrees, 90 degrees
  3. 5. across a circle
  4. 6. the outlines of objects
  5. 7. lines that go sideways
  6. 8. 30 degree drawing
  7. 10. lines that go up
  8. 11. lines that are next to each other going the same direction