Geometry Crossword Puzzle

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Across
  1. 3. larger than 90°
  2. 4. triangle with all 3 sides of equal length
  3. 5. two angles whose sum is 90°
  4. 7. angle-angle-side
  5. 9. line has a starting point but no endpoint
  6. 12. lines have a negative reciprocal slope
  7. 13. intersection of two rays at an endpoint
  8. 15. flat surface made up of points
  9. 16. non-coplanar lines that never intersect
  10. 17. side-side-side
  11. 18. hypotenuse-leg
Down
  1. 1. difference in size, degree, circumstances
  2. 2. two angles whose sum is 180°
  3. 6. common endpoint of an angle
  4. 8. lines have the same slope
  5. 10. less than 90°
  6. 11. a line that intersects two or more lines
  7. 12. is a location with no size or shape
  8. 14. made of points with no thickness or width
  9. 16. side-angle-side