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sqdancefan
These aren't that hard--especially once you've done the first 13 questions. There are many 45-45-90 triangles in there.
  14. ∠BCO = 45°
  15. ∠GOF = 45°
  16. ∠OFG = 45°
  17. ∠GFH = 180° - ∠JFH = 58°
  18. ∠FGH = 90°
  19. ∠EFJ = 45°
  20. ∠GOC = 180° (the points are collinear)

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