circle

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Across
  1. 4. circles with the same centre
  2. 6. the longest chord of a circle
  3. 8. a closed figure bounded by three line segments
  4. 10. the line which lie on the same plane and do not intersect
  5. 11. the points which lie on the same straight line
  6. 12. half of a circle
Down
  1. 1. a triangle whose all sides are equal
  2. 2. The perimeter of a circle
  3. 3. angled triangle a triangle in which every angle is an acute angle
  4. 5. a line segment whose end points lie on the circle
  5. 7. the common end point of the angle
  6. 9. a smooth flat surface which extends endlessly in all the directions