Foundational words of geomotry

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Across
  1. 2. On the side of the board is a straight
  2. 4. When you see yourself in the mirror its a
  3. 5. Two lines going the same direction
  4. 9. y-y,=m (x-x,)
  5. 10. On a graph paper there's the X' and Y's
  6. 11. Anything that is 180 degree is a
Down
  1. 1. When a line intercepts a box is called
  2. 3. On a line there's a on A and B
  3. 5. A flat surface
  4. 6. Anything that is a 90 degree is a
  5. 7. Y=mx+b
  6. 8. When ABC are connected but aren't closed