Problem K. 439. (December 2014)
K. 439. Each side of the figure in the diagram is 10 cm long, and each interior angle is \(\displaystyle 30^\circ\), \(\displaystyle 60^\circ\), \(\displaystyle 150^\circ\), or \(\displaystyle 300^\circ\). Find the area of the figure.
(6 pont)
Deadline expired on 12 January 2015.
Statistics:
115 students sent a solution.  
6 points:  75 students. 
5 points:  10 students. 
4 points:  11 students. 
3 points:  6 students. 
2 points:  3 students. 
1 point:  1 student. 
Unfair, not evaluated:  8 solutions. 
Unfair, not evaluated:  1 solution. 
