Problem B. 4681. (January 2015)
B. 4681. What is the area of the pentagon in exercise C. 1240.?
(4 pont)
Deadline expired on 10 February 2015.
Statistics:
86 students sent a solution.  
4 points:  63 students. 
3 points:  10 students. 
2 points:  2 students. 
1 point:  1 student. 
0 point:  10 students. 
