Geometry crossword

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Across
  1. 1. a polygon with 5 sides and angles
  2. 3. an angle that is less than 90 degrees
  3. 4. a straight line extending through the center of a circle
  4. 6. a triangle that equals 90 degrees
  5. 8. a quadrilateral with four equal sides and equal length
  6. 11. a ongoing extent of
  7. 12. a straight line extending from the center of the circle
  8. 14. a polygon with 8 sides and angles
  9. 15. a parallelogram having four equal angles
  10. 18. a quadrilateral having both opposite sides parallel
Down
  1. 1. two lines that cross to form a 90 degree angle
  2. 2. an angle that equals 90 degrees
  3. 5. lines that do not intersect
  4. 7. a triangle with equal sides and angles
  5. 9. lines that cross each other
  6. 10. a triangle that has two sides that are equal
  7. 12. an equilateral parallelogram having oblique angles
  8. 13. an angle that is more than 90 degrees
  9. 16. a polygon with 6 sides and 6 angles
  10. 17. a quadrilateral having two parallel and two non parallel sides