Circle

4. a polygon that has three sides
7. a straight line that joins two points on a curve
9. a polygon which all the length of the sides are equal
11. a flat shape with at least three straight sides and angles, and usually five or more
14. a triangle inside a circle that the three apexes all touch the circumference
17. a triangle with two of its three sides the same length
21. a circle that contains a polygon inside
22. a quadrilateral which all the sides are the same length
24. a flat shape with six straight sides and six angles
25. a flat shape with twelve straight sides and twelve angles
26. forming an angle of 90° with another line or surface
27. the point where all the diagonals meet
28. a straight line that touches the outside of a curve but does not cross it
29. a flat shape with eight straight sides and eight angles
30. Two circles are tangency and one is inside of another one
31. an angle formed between the side of a shape and the side next to it

1. the longest chord in a circle
2. a flat shape that has five sides
3. a flat shape with nine straight sides and nine angles
5. a straight line between the centre of a circle and any point on its outer edge
6. a triangle whose three sides are all the same length
8. a flat shape with ten straight sides and ten angles
10. an angle formed inside a shape where two sides of the shape meet
12. Two circles are tangency on the outside
13. the line that goes around the circle
15. a part of a circle lying between two straight lines drawn from the centre to the edge
16. a flat shape with seven straight sides and seven angles
18. the perpendicular from the centre of a regular polygon to one of the sides
19. to divide sth into two equal parts
20. a flat shape with four straight sides
23. a straight line that cuts a curve in two or more parts
32. the centre of a inscribed circle