Level 1 (easy)

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Across
  1. 5. a round shape with two sides
  2. 7. has five edges
  3. 9. 90 degrees angle
  4. 10. does not go through the middle of a shape
  5. 11. half of a circle
  6. 12. over 90 degrees angle
  7. 13. under 90 degrees angle
Down
  1. 1. inside of a shape (3d)
  2. 2. half of diameter
  3. 3. an eight sided polygon
  4. 4. inside of a shape (2d)
  5. 6. A flat shape with four sides
  6. 8. has four sides and four edges
  7. 10. outside of a circle