Geometry Crossword Puzzle

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Across
  1. 4. / a quadrilateral plane figure having two parallel and two nonparallel sides
  2. 7. / an angle less than 90 degrees but greater than 0 degrees
  3. 11. / a polygon having eight angles and eight sides
  4. 12. / a polygon with 5 sides and 5 angles
  5. 14. / a triangle which has two sides equal
  6. 16. / a closed plane curve consisting of all points at a given distance from a point within it called the center
  7. 17. / a parallelogram having four right angles
  8. 18. / the part of a straight line considered as originating at a point on the line and as extending in one direction from that point
  9. 19. / the intersection point of two sides of a plane figure
Down
  1. 1. / all properties of parallelograms, rectangles, and rhombi
  2. 2. a square is also a rectangle
  3. 3. / a position in space
  4. 5. Line Segments / two line segments which cross to form 90 degree angles
  5. 6. /line segments that do not intersect
  6. 8. / an equilateral parallelogram having oblique angles
  7. 9. / one part of a line
  8. 10. / a polygon with four sides
  9. 13. / a 90-degree angle
  10. 15. / an angle greater than 90 degrees but less than 180 degrees