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You must be logged in to vote IMO 2005/5
25MMedium, IMO 2/5 Miquel ๅฎ็ๅฏๅ ๅฎ็ ๆ่ฝฌไฝไผผๅๆขSpiral similarity ๅคๆฅๅ็ๅฎ็นCircumcircle fixed point Simson ๅฎ็่ฅฟๅงๆพๅฎ็ -
You must be logged in to vote USA TST 2008/7
้ๅฟๅๆ Barycentric coordinates ๅๆผInversion Ptolemy ๅฎ็ๆๅๅฏๅฎ็ Miquel ๅฎ็ๅฏๅ ๅฎ็ Pascal ๅฎ็ๅธๆฏๅกๅฎ็ Dumpty ็น ๆ่ฝฌไฝไผผๅๆขSpiral similarity ๅคๆฐๆณComplex numbers ๅคๆฅๅ็ๅฎ็นCircumcircle fixed point -
You must be logged in to vote ELMO Shortlist 2013/G3
้ๅฟๅๆ Barycentric coordinates ๅๆผInversion Ptolemy ๅฎ็ๆๅๅฏๅฎ็ Humpty ็น Brocard ๅฎ็ Miquel ๅฎ็ๅฏๅ ๅฎ็ Pascal ๅฎ็ๅธๆฏๅกๅฎ็ ๅคๆฅๅ็ๅฎ็นCircumcircle fixed point -
You must be logged in to vote IMO 2014/4
5MSomewhat easy ้ๅฟๅๆ Barycentric coordinates ่ฐๅ็นๅHarmonic bundle ๅๆผInversion -
You must be logged in to vote USAMO 2009/1
ๆ นๅฟRadical center 10MEasy, IMO 1/4 -
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ไน็นๅEuler circle 15MSomewhat easy ่ฐๅ็นๅHarmonic bundle
