Integer angled Quadrilaterals
I solved this problem after I solved more than 300 problems. I was worried about accuracy too much. But actually it is not an issue. Two key words need one's attention, convexity and distinct (non-similar) solutions. I strongly recommend one to solve it independently. After I solved it, I was so happy! However it is not an easy problem. More than five years passed, only 600+ people solved this problem. So this is definitely the most difficult problem in the first 200 PE problem.
I am curious how this problem is created. Genius!
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