@math

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Across
  1. 2. line segment extending from the center of a circle to the circumference
  2. 5. an area closed by a chord
  3. 7. quadrilateral in a circle
  4. 8. the plane figure enclosed by two radii of a circle
  5. 9. a line intersecting a circle in exactly one point and makes 90 degree with circle
Down
  1. 1. half of a circle
  2. 3. both sides of line segment touching circumference of circle it also passes through center of circle
  3. 4. a line touching the circle
  4. 6. a round figure