Mathematical shape vocabulary

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Across
  1. 3. the length from the centre of a circle to one outer edge
  2. 4. the name given to a 4 sided shape
  3. 7. a triangle with equal sides and angles
  4. 8. a quadrilateral with equal sides and angles
  5. 10. the perimeter of a circle
  6. 11. the middle point of a circle
  7. 12. like the lines on a train track
Down
  1. 1. a triangle with 2 equal angles and sides
  2. 2. a quadrilateral with only 1 pair of parallel sides
  3. 5. a quadrilateral with 2 pairs of parallel lines and angles of a different size
  4. 6. when a line joins with another line at exactly 90 degrees
  5. 9. the length of the line through the centre of a circle from one side to the other