## Search found 7 matches

Mon Feb 05, 2018 7:54 pm
Forum: News / Announcements
Replies: 4
Views: 117

### Re: geometry(iranian geometry olympiad 2017)

I am being unable of understanding the main concept of the problem. Truly to say ,can't understand the problem. I would be grateful if you do help me
Sun Jan 28, 2018 11:03 pm
Forum: Junior Level
Topic: problem 5 (elementary) Iranian geometry Olympiad 2017
Replies: 3
Views: 102

### problem 5 (elementary) Iranian geometry Olympiad 2017

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.

Sun Jan 28, 2018 10:59 pm
Forum: News / Announcements
Replies: 4
Views: 117

4. P1,P2,...,P100 are 100 points on the plane, no three of them are collinear. For each three points, call their triangle clockwise if the increasing order of them is in clockwise order. Can the number of clockwise triangles be exactly 2017?

help me solving the problem
Sat Nov 18, 2017 8:02 pm
Forum: Junior Level
Topic: BDMO 2016: National Junior/2
Replies: 4
Views: 622

### Re: BDMO 2016: National Junior/2

Sat Nov 18, 2017 7:52 pm
Forum: Junior: Solved
Topic: Dhaka Junior 2011/5
Replies: 5
Views: 1347

### Re: Dhaka Junior 2011/5

surjo wrote:I did not get it. 9*9=81 should be palindromic numbers

mate it will be 9 * 10
Sat Nov 18, 2017 7:50 pm
Forum: Junior: Solved
Topic: Dhaka Junior 2011/5
Replies: 5
Views: 1347

### Re: Dhaka Junior 2011/5

it will be 90
Thu Oct 12, 2017 11:41 am
Forum: Junior Level
Topic: BDMO 2016: National Junior/2
Replies: 4
Views: 622