Circle (by Hardy)

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Across
  1. 2. a shape with 4 equal sides and every angle is a right angle
  2. 8. a nine-sided polygon
  3. 9. a triangle that has two sides of equal length
  4. 12. a polygon with three edges and three vertices
  5. 13. a ten-sided polygon
  6. 14. a six-sided polygon
  7. 15. a triangle center
  8. 16. the center of mass
  9. 17. a polygon that is equiangular and equilateral
Down
  1. 1. a seven-sided polygon
  2. 3. a polygon with four edges and four vertices
  3. 4. circle a circle that passes through all the vertices of the polygon
  4. 5. a triangle in which all three sides are equal
  5. 6. a twelve-sided polygon
  6. 7. each vertex of the triangle lies on the circle
  7. 10. an eight-sided polygon
  8. 11. is any five-sided polygon