Gabriel T, Loïc Z, Arthur M

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Across
  1. 1. segment that connects two points on the circle
  2. 2. a straight line from the center to the perimeter of a circle
  3. 6. of equal importance, rank, or degree
  4. 9. a triangle with no two sides of equal length
  5. 11. a polyhedron having a polygonal base and triangular sides
  6. 12. a line that touches a curve at only one point
  7. 13. a quadrilateral with one pair of parallel sides
Down
  1. 1. the length of the closed curve of a circle
  2. 3. a parallelogram with four equal sides and opposite equal angles
  3. 4. ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
  4. 5. Triangles containing a single 90° angle
  5. 6. a surface generated by rotating a line around a fixed line
  6. 7. a round three-dimensional closed surface
  7. 8. a point equidistant from the ends of a line or the extremities of a figure
  8. 10. ratio of the adjacent side to the hypotenuse of a right-angled triangle
  9. 14. being everywhere equidistant and not intersecting