geometry

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Across
  1. 3. a single dot on a graph
  2. 4. a triangle center
  3. 5. part of a plane
  4. 10. Three sides of a inverse triangle
  5. 11. supplementary angles
  6. 12. a line segment
  7. 13. Something that makes a table
Down
  1. 1. 120 degrees or higher
  2. 2. geometric principles
  3. 3. two - dimensional surface
  4. 6. 90 degrees
  5. 7. Vertex of the opposite side of a triangle
  6. 8. extends in one direction
  7. 9. a quadrilateral