Foundational Words of Geometry

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Across
  1. 3. Football field.
  2. 7. The surface of floor.
  3. 9. Two straight lines.
  4. 11. y=mx+b
  5. 12. When you look at yourself in the mirror.
Down
  1. 1. A plane inclined staircase.
  2. 2. A dot.
  3. 4. The corner of a room.
  4. 5. A pencil or a stick.
  5. 6. Two lines that don't touch.
  6. 8. Freeway cars are behind one another.
  7. 10. y2-y,=m(x2-x,)