Geometry crossword puzzle

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Across
  1. 1. two line segments which cross to form 90 degree angles
  2. 5. Two figures that are same
  3. 6. a figure having two parallel & non-parallel sides.
  4. 9. An angle that is 180 degrees
  5. 11. two angles that add up to 90 degrees.
  6. 13. a polygon with 5 sides and 5 angles
  7. 14. a quadrilateral with all equal sides
  8. 15. V=lwh/3
  9. 16. C=2πr
  10. 17. the amount of space within the perimeter of a 2D shape
  11. 20. P = (L + W) × 2
Down
  1. 2. two angles that sum up to 180 degrees.
  2. 3. a 90 degree angle
  3. 4. An angle point to point
  4. 7. an angle less than 90 degrees but greater than 0 degrees
  5. 8. a triangle in which all three sides have the same length
  6. 10. A curve with no endpoints
  7. 12. more than 90 degrees but less than 180 degrees.
  8. 18. D=2r
  9. 19. An open diagram of a shape.
  10. 20. A location