Geometry Crossword Puzzle

1. A line segment. The segment's two ends both lie where they meet the edge of a circle.
5. A four sided figure. Has four vertices and angles.
6. The center of a shape. The very middle point in a figure.
8. A six sided polygon. Has six angles and six vertices.
10. The perimeter of a circle. Measures the exterior distance of a circle.
13. A type of angle. Measures more than ninety degrees.
14. A quadrilateral. Has four congruent sides.
16. A type of triangle. Two sides of the triangle are equivalent in length.
18. A four sided figure. Has two sets of congruent sides.
19. Part of a straight line. Marked by two distinct ending points.
21. The space between two lines that intersect at a point. Measured in degrees.

2. A ninety degree angle. Forms when two lines meet and are perpendicular.
3. An infinitely long object. Has no ending points.
4. A four sided figure. Has one set of parallel sides.
7. A four sided figure. Has two sets of parallel sides.
9. A type of angle. Measures less than ninety degrees.
11. A line that touches a circle at only one point. The line touches the circle at the curve.
12. A point. It marks each angular point in a figure.
15. A round figure. Has no sides or vertices.
17. A four sided figure. Opposite sides are parallel.
20. A three sided figure. Has three angles and three vertices.