Mathematical and Physical Journal
for High Schools
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Problem B. 4642. (September 2014)

B. 4642. Given that no three of five points in the plane are collinear, prove that there are at most seven acute-angled triangles among the triangles determined by the five points.

(4 pont)

Deadline expired on October 10, 2014.


172 students sent a solution.
4 points:95 students.
3 points:24 students.
2 points:21 students.
1 point:16 students.
0 point:16 students.

Problems in Mathematics of KöMaL, September 2014