Geometry

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Across
  1. 3. Inventor of the Right-Angle-Triangle Theorem
  2. 8. A plane used to represent positions of points
  3. 10. A 2D space
  4. 11. a line used to represent 1D objects
  5. 12. name of the x co-ordinate
Down
  1. 1. Perimeter of a circle
  2. 2. A 3-sided polygon
  3. 4. Measure of space enclosed in a polygon
  4. 5. An infinite straight length
  5. 6. y co-ordinate over x co-ordinate
  6. 7. name of the y co-ordinate
  7. 9. Four of me are formed by intersection of 2 lines