Geometry crossword

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Across
  1. 3. An angle less than 90 degrees but more than 0 degrees
  2. 4. The space between two lines or planes that intersect
  3. 7. A parallelogram with four equal sides.
  4. 9. the 90 degree angle between two perpendicular lines
  5. 11. An area that is in the middle of some larger region
  6. 12. A quantity obtained by the addition of a group of numbers
  7. 13. A continuous potion of a circle
  8. 14. Another word for mathematics
  9. 15. A parallelogram with four right angles
Down
  1. 1. A three-sided polygon
  2. 2. A line enclosing a plane area
  3. 5. The middle point of a line
  4. 6. two angles whose sum upto a right angle
  5. 8. The space between two things
  6. 9. A straight line from the center of the perimeter of a circle
  7. 10. The length of a straight line through the center or circle