Geometry size and shape

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Across
  1. 2. all angles are congruent
  2. 4. if they touch two lines at a certain point
  3. 5. means to lie on the same plane
  4. 8. each sides are pararell and conguent
  5. 10. all its angles are rigth angles
  6. 11. infinite width and height but no thickness
  7. 12. subset of a line which have two endpoints
  8. 13. polygon with 3 sides
Down
  1. 1. to lie into same line
  2. 3. polygon with 4 sides
  3. 6. Union of two collinear rays
  4. 7. imagine has no dimension
  5. 9. two rays lying on the same line
  6. 10. all sides are congruent and have angles acute or obtuse
  7. 12. straight infinite length