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TNP · 26-03-2016, 10:20 PM

I think I can solve 3b with inversion, I will post the solution later. I think this is the hardest geometry problem in VNTST history.

Problem 5 is very nice, for 5b we only need to consider the case $n=k$ thanks to the results from 5a.

26-03-2016, 10:20 PM	#17
TNP +Thành Viên+ Tham gia ngày: Feb 2012 Đến từ: PTNK TPHCM Bài gởi: 180 Thanks: 487 Thanked 106 Times in 67 Posts	I think I can solve 3b with inversion, I will post the solution later. I think this is the hardest geometry problem in VNTST history. Take inversion center $I$ that preserves $(O)$ Problem 5 is very nice, for 5b we only need to consider the case $n=k$ thanks to the results from 5a. __________________ Believe in yourself $\Leftrightarrow$ Believe in miracles