The geometry

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Across
  1. 1. The lenght, the height and the ...
  2. 3. Pythagore did one.
  3. 4. It is half a cicle.
  4. 7. It is half a diameter.
  5. 10. It is when we grow a figure.
  6. 12. the point equidistant from the two ends of a segment.
  7. 13. It is the version in 3 dimensions of a rectangle.
  8. 15. This is the point of intersection of two line segments.
Down
  1. 2. It is a triangle with two sides of the same length.
  2. 5. It is a part of a circle.
  3. 6. tangent, sine, ...
  4. 8. It is a quadrilateral that has every sides of the same length.
  5. 9. It is a ploygon with 4 sides.
  6. 11. It is an infinit trait.
  7. 14. It is an angle under 90 °.