Geometry crossword puzzle

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Across
  1. 4. A parallelogram with all sides of the same length.
  2. 6. A parallelogram with four right angles.
  3. 8. A line segment from a vertex of a triangle perpendicular to the opposite side.
  4. 12. The point where the medians of a triangle intersect.
  5. 14. The point where the perpendicular bisectors of a triangle intersect.
  6. 15. The point where the altitudes of a triangle intersect.
  7. 17. A ray that divides an angle into two equal angles.
  8. 18. A quadrilateral with at least one pair of parallel sides.
Down
  1. 1. A line or line segment that intersects another line segment at a right angle and divides it into two equal parts.
  2. 2. Having all sides of equal length.
  3. 3. A quadrilateral with opposite sides parallel and equal.
  4. 5. A rectangle with four equal sides and four right angles.
  5. 7. A quadrilateral with two distinct pairs of adjacent sides that are congruent.
  6. 9. Having the same distance; a characteristic of the points on the perpendicular bisector of a line segment.
  7. 10. A line segment from a vertex of a triangle to the midpoint of the opposite side.
  8. 11. The point where the angle bisectors of a triangle intersect.
  9. 13. A line segment connecting two non-adjacent vertices in a polygon.
  10. 16. Having all angles equal.