Across
- 3. half of the diameter
- 5. having four straight equal sides and four angles of 90°
- 7. dividing something into two equal parts
- 10. the intersections of the angular bisectors is the center of it
- 12. a flat shape with eight straight sides and eight angles
- 16. a flat shape with four straight sides
- 17. two circles only contact on one point with overlapped area
- 20. the portion of a circle enclosed by two radii and an arc
- 21. two unparallel lines may have
- 24. a flat shape with at least three straight sides and angles, and usually five or more
- 25. the angle inside two adjacent sides of a polygon
- 28. a line that goes around a circle or any other curved shape; the length of this line
- 29. a flat shape with seven straight sides and seven angles
- 30. “to cut”
- 32. a flat shape with twelve straight sides and twelve angles
- 33. a flat shape with ten straight sides and ten angles
Down
- 1. a line segment joining two points on a curve
- 2. triangle with the same side length on two sides
- 4. the intersecting point of the angular bisector of a triangle
- 6. two circles only contact on one point without overlapped area
- 8. the vertexes of the triangles are all on the circle
- 9. triangle with the same side length on three sides
- 11. polygon with the same interior angles and sides’ lengths.
- 13. a line segment from the center to the midpoint of one of its sides
- 14. a straight line going from one side of a circle or any other round object to the other side, passing through the centre
- 15. 180°- interior angle
- 18. a flat shape with three straight sides and three angles
- 19. a flat shape with six straight sides and six angles
- 22. a flat shape with nine straight sides and nine angles
- 23. the intersecting points of the medians of a triangle
- 26. a flat shape with five straight sides and five angles
- 27. 90°
- 28. the set of points which are an equal distance to a fixed point
- 31. a straight line that touches the outside of a curve but does not cross it