Geometry

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Across
  1. 4. a mathematician who gave basic proportionality theorem
  2. 7. a quadrilateral with opposite sides equal
  3. 8. a triangle with any 2 sides equal
Down
  1. 1. longest chord of circle
  2. 2. a triangle with all sides equal
  3. 3. polynomial with one term
  4. 5. half of diameter
  5. 6. mathematician who gave formula of sum of n terms
  6. 9. father of geometry