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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 points)

This problem is for grade 9 students only.

Deadline expired on 12 January 2015.

Statistics on problem K. 439.
 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.

• Problems in Mathematics of KöMaL, December 2014

•  Támogatóink: Morgan Stanley