Shape meeting

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Across
  1. 3. A kind of angle that degree does not change.
  2. 6. What lines do chimps hate most?
  3. 9. The partial rectangle.
  4. 11. The angle shaped like uphill.
  5. 12. The most symmetric triangle.
  6. 13. The shape is like the number one.
Down
  1. 1. The four brothers are as long as they are. The parade formation is often used, and the symmetrical axis has four.
  2. 2. The angle shaped like downhill.
  3. 3. The partial square.
  4. 4. A kind of angle with the smallest opening.
  5. 5. A big triangle without a sharp angle above,up and down parallel and the left and right sides of the line go to the center.
  6. 7. Line up for medicine.
  7. 8. The angle shaped like straight line.
  8. 10. The shape of normal whiteboard.