Geometry Crossword Puzzle

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Across
  1. 1. the space inside a shape
  2. 4. four sided polygon
  3. 5. measure around a shape
  4. 8. figure formed by 2 rays
  5. 10. middle point of a line segment
  6. 11. quadrilateral with at least one pair of parallel sides
  7. 13. triangle where all 3 sides have equal length
  8. 15. perimeter of a circle
  9. 16. where two lines meet
  10. 17. polygon with three edges and three verticals
  11. 18. triangle where 2 sides make a 90 degree angle
  12. 19. three dimensional shape
Down
  1. 2. half the diameter
  2. 3. lines that intersect to make 90 degree angles
  3. 6. lines that never intersect
  4. 7. having the same size and shape
  5. 9. triangle with 2 sides of equal length
  6. 12. straight line that passes through a circle
  7. 14. Pythagorean theorem
  8. 15. three dimensional solid