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C. 1303. The area of a rectangular origami sheet is $\displaystyle 130~\rm{cm}^2$. The sheet is folded symmetrically by forming a regular triangle with two adjacent vertices turned inwards, as shown in the figure. Find the lengths of the sides of the original sheet.

(5 points)

Deadline expired on 12 October 2015.

Statistics on problem C. 1303.
 349 students sent a solution. 5 points: 259 students. 4 points: 53 students. 3 points: 12 students. 2 points: 4 students. 1 point: 2 students. 0 point: 3 students. Unfair, not evaluated: 5 solutions. Unfair, not evaluated: 11 solutions.

• Problems in Mathematics of KöMaL, September 2015

•  Támogatóink: Morgan Stanley