Geometry crossword puzzle

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Across
  1. 5. a polygon having eight angles and eight sides
  2. 6. a triangle which has two sides equal
  3. 11. a quadrilateral having both pairs of opposite sides parallel to each other Note: squares and rectangles are also quadrilaterals
  4. 14. a polygon with four sides Note: squares, rectangles and trapezoids are also quadrilaterals
  5. 16. a rectangle having all four sides of equal length
  6. 17. a triangle with one internal angle equal to 90 degrees
  7. 18. an angle less than 90 degrees but greater than 0 degrees
  8. 21. a continuous extent of length
  9. 22. a closed plane curve consisting of all points at a given distance from a point within it called the center
  10. 24. the line segment between two points on a given curve
  11. 25. a polygon having six sides and six angles
Down
  1. 1. a triangle having three unequal sides and angles
  2. 2. a polygon with 5 sides and 5 angles
  3. 3. a curve that is continuous and has endpoints that meet at the same point
  4. 4. one part of a line
  5. 7. a triangle with all sides equal and all angles equal
  6. 8. an equilateral parallelogram having oblique angles
  7. 9. the intersection point of two sides of a plane figure
  8. 10. a parallelogram having four right angles Note: a square is also a rectangle
  9. 12. an angle greater than 90 degrees but less than 180 degrees
  10. 13. a straight line extending from the center of a circle or sphere to the circumference or surface
  11. 15. a 90-degree angle
  12. 19. a quadrilateral plane figure having two parallel and two nonparallel sides
  13. 20. a position in space
  14. 23. the part of a straight line considered as originating at a point on the line and as extending in one direction from that point