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  1. 2. 90°
  2. 4. having four straight equal sides and four angles of 90°
  3. 6. the intersections of the triangles’ medians
  4. 7. a flat shape with at least three straight sides and angles, and usually five or more
  5. 9. a flat shape with four straight sides
  6. 13. a line that goes around a circle or any other curved shape; the length of this line
  7. 14. a flat shape with six straight sides and six angles
  8. 17. triangle with the same side length on two sides
  9. 23. a flat shape with five straight sides and five angles
  10. 24. “to cut”
  11. 25. triangle with the same side length on three sides
  12. 27. a flat shape with twelve straight sides and twelve angles
  13. 30. a line segment joining two points on a curve
  14. 32. a flat shape with eight straight sides and eight angles
  15. 33. half of the diameter
  16. 34. a flat shape with ten straight sides and ten angles
  1. 1. two unparallel lines may have
  2. 3. 180°- interior angle
  3. 5. of a regular polygon is a line segment from the center to the midpoint of one of its sides
  4. 8. the point where the internal angle bisectors of the triangle cross
  5. 10. two circles only contact on one point, and they are on the same side
  6. 11. the intersections of the triangles’ angular bisectors is the center of the circle
  7. 12. the portion of a circle enclosed by two radii and an arc
  8. 15. a flat shape with seven straight sides and seven angles
  9. 16. a flat shape with three straight sides and three angles
  10. 18. a flat shape with nine straight sides and nine angles
  11. 19. the vertexes of the triangles are all on the circle
  12. 20. a straight line that touches the outside of a curve but does not cross it
  13. 21. polygon with the same interior angles and sides’ lengths.
  14. 22. two circles only contact on one point, and they are on the different side
  15. 26. the angle inside two adjacent sides of a polygon
  16. 28. a straight line going from one side of a circle or any other round object to the other side, passing through the centre
  17. 29. the set of points which are an equal distance to a fixed point
  18. 31. dividing something into two equal parts