Across
- 2. a flat shape with six straight sides and six angles
- 8. the intersections of the angular bisectors is the center of it
- 10. a flat shape with three straight sides and three angles
- 13. a flat shape with four straight sides
- 15. two circles only contact on one point with overlapped area
- 16. a flat shape with eight straight sides and eight angles
- 17. the intersecting point of the angular bisector of a triangle
- 18. a flat shape with twelve straight sides and twelve angles
- 19. a flat shape with ten straight sides and ten angles
- 20. two circles only contact on one point without overlapped area
- 21. a line segment from the center to the midpoint of one of its sides
Down
- 1. a flat shape with at least three straight sides and angles, and usually five or more
- 3. the intersecting points of the medians of a triangle
- 4. triangle with the same side length on three sides
- 5. triangle with the same side length on two sides
- 6. polygon with the same interior angles and sides’ lengths.
- 7. a flat shape with five straight sides and five angles
- 9. the vertexes of the triangles are all on the circle
- 11. a flat shape with seven straight sides and seven angles
- 12. having four straight equal sides and four angles of 90°
- 14. a flat shape with nine straight sides and nine angles