In the isosceles triangle ABC (AB = AC), let l be a line parallel to BC through A. Let D be an arbitrary point on l. Let E, F be the feet of perpendiculars through A to BD, CD respectively. Suppose that P, Q are the images of E, F on l. Prove that AP + AQ ≤ AB.
please help me solving the problem
problem 5 (elementary) Iranian geometry Olympiad 2017
"God made the integers; all else is the work of man."
Re: problem 5 (elementary) Iranian geometry Olympiad 2017
Post the problem in some other forum,like AoPS.This forum is dead.
- M. M. Fahad Joy
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Re: problem 5 (elementary) Iranian geometry Olympiad 2017
Why is this forum dead?
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Re: problem 5 (elementary) Iranian geometry Olympiad 2017
[img]Here is the official solution.[/img
Re: problem 5 (elementary) Iranian geometry Olympiad 2017
please follow the board book of class 7.