Geometry crossword

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Across
  1. 3. the length of the closed curve of a circle
  2. 7. a quadrilateral whose opposite sides are parallel and equal
  3. 8. Be at an angle
  4. 9. the length of a straight line through the center of the circle
  5. 13. a specific identifiable position in a continuum of series
  6. 14. a 4 sided polygon
  7. 15. an angle less than 180 degrees but more than 90 degrees
Down
  1. 1. an angle less than 90 degrees but more than 0 degrees
  2. 2. The extent of a 2-D surface enclosed within a boundary
  3. 4. A straight line from the center to the Perimeter of a circle
  4. 5. A line enclosing a plane area
  5. 6. Being essentially comparable to something
  6. 10. The 90 degree angle between 2 perpendicular lines
  7. 11. Relation with respect to comparative quantity or magnitude
  8. 12. Being everywhere equidistant and not intersecting