Fantastic special numbers and diagrams

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Across
  1. 2. A shape consisting of a curved line completely surrounding an are. Every part of the line is the same distance from the center of the area.
  2. 6. A parallelogram with right angles
  3. 7. A rectangle with equal sides
  4. 9. A quadrilateral which only are pair of opposite sides are parallel
  5. 11. 50÷10=5， the math terminology for 50
  6. 12. 5*4=20, the math terminology for 5
  7. 14. 50÷10=5, the math terminology for 10
Down
  1. 1. there are 3 sides of the graph
  2. 3. 6-2=4, the math terminology for 2
  3. 4. 6-2=4, the math terminology for 6
  4. 5. Both pair of opposite sides are parallel
  5. 8. 5*4=20, the math terminology for 4
  6. 10. A parallelogram with equal side length
  7. 13. 1+2=3, the math terminology for 1 or 2