Geometry Crossword Puzzle

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Across
  1. 1. A line segment. The segment's two ends both lie where they meet the edge of a circle.
  2. 5. A four sided figure. Has four vertices and angles.
  3. 6. The center of a shape. The very middle point in a figure.
  4. 8. A six sided polygon. Has six angles and six vertices.
  5. 10. The perimeter of a circle. Measures the exterior distance of a circle.
  6. 13. A type of angle. Measures more than ninety degrees.
  7. 14. A quadrilateral. Has four congruent sides.
  8. 16. A type of triangle. Two sides of the triangle are equivalent in length.
  9. 18. A four sided figure. Has two sets of congruent sides.
  10. 19. Part of a straight line. Marked by two distinct ending points.
  11. 21. The space between two lines that intersect at a point. Measured in degrees.
Down
  1. 2. A ninety degree angle. Forms when two lines meet and are perpendicular.
  2. 3. An infinitely long object. Has no ending points.
  3. 4. A four sided figure. Has one set of parallel sides.
  4. 7. A four sided figure. Has two sets of parallel sides.
  5. 9. A type of angle. Measures less than ninety degrees.
  6. 11. A line that touches a circle at only one point. The line touches the circle at the curve.
  7. 12. A point. It marks each angular point in a figure.
  8. 15. A round figure. Has no sides or vertices.
  9. 17. A four sided figure. Opposite sides are parallel.
  10. 20. A three sided figure. Has three angles and three vertices.