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Fantastic special numbers and diagrams

12345678910111213
Across
  1. 1. 1+2=3, the math terminology for 1 or 2
  2. 6. A parallelogram with right angles
  3. 8. 5*4=20, the math terminology for 5
  4. 9. 6-2=4, the math terminology for 2
  5. 10. 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.
  6. 11. there are 3 sides of the graph
  7. 13. A rectangle with equal sides
Down
  1. 2. 50÷10=5, the math terminology for 10
  2. 3. A quadrilateral which only are pair of opposite sides are parallel
  3. 4. 5*4=20, the math terminology for 4
  4. 5. 50÷10=5, the math terminology for 50
  5. 7. Both pair of opposite sides are parallel
  6. 8. 6-2=4, the math terminology for 6
  7. 12. A parallelogram with equal side length