Across
- 6. having four straight equal sides and four angles of 90°
- 10. a flat shape with four straight sides
- 12. the intersections of the triangles’ angular bisectors are all on the circle
- 13. a flat shape with five straight sides and five angles
- 15. two circles only contact on one point, and they are on the different side
- 17. a flat shape with six straight sides and six angles
- 18. of a regular polygon is a line segment from the center to the midpoint of one of its sides
- 19. a flat shape with eight straight sides and eight angles
- 20. a flat shape with at least three straight sides and angles, and usually five or more
Down
- 1. a flat shape with three straight sides and three angles
- 2. triangle with the same side length on three sides
- 3. the vertexes of the triangles are all on the circle
- 4. a flat shape with twelve straight sides and twelve angles
- 5. polygon with the same interior angles and sides’ lengths.
- 7. triangle with the same side length on two sides
- 8. the intersecting point of the angular bisector of a triangle
- 9. the intersecting points of the medians of a triangle
- 11. a flat shape with seven straight sides and seven angles
- 14. a flat shape with nine straight sides and nine angles
- 16. a flat shape with ten straight sides and ten angles