geometry crossword

4. a line with a single endpoint (or point of origin) that extends infinitely in one direction
9. The distance around the boundary of a circle
11. a figure which is formed by two rays or lines that shares a common endpoint
12. a type of triangle that has any two sides equal in length
13. bounded by two distinct points on a line
14. a closed two-dimensional polygon with six sides
15. An angle which is measuring less than 90 degrees
17. quadrilaterals that have two parallel sides and two non-parallel sides
19. a three-sided polygon that consists of three edges and three vertices

1. if their measures add to 90 degrees
2. a two-dimensional shape with four sides, four vertices, and four angles
3. a straight one-dimensional figure that does not have a thickness, and it extends endlessly in both directions
5. the highest point; the top or apex
6. an angle of exactly 90 degrees
7. the middle point of a line segment
8. a closed two-dimensional figure with eight sides,eight vertices and eight interior angles
9. a closed two-dimensional figure in which the set of all the points in the plane is equidistant from a given point called “centre"
10. two lines that never touch
16. when something is the same shape and size
18. a location