Car and Chinese granary

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Across
  1. 2. distance from the centre of the earth to its surface is 6371km
  2. 3. the point in the middle of a circle
  3. 6. the longest line segment in a right triangle
  4. 9. the surface of diamond
  5. 11. half of the rectangle(draw a line between two opposite point)
  6. 12. the shape of the skirt
  7. 13. the angle of the folding fan
  8. 15. the angle of the beak
Down
  1. 1. the length of the earth from the East to the West
  2. 4. an angle of A4 paper
  3. 5. two line segments cause four angles, two of them have same degrees
  4. 7. the length of the field is 14m
  5. 8. the shape of a piece of A4 paper
  6. 10. the boy is 185cm
  7. 14. the surface of Rubik's cube