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C. 821. A unit square ABCD is rotated about its vertex C through 90^{o}. Determine the area swept out by the side AB.

(5 points)

Deadline expired on 15 November 2005.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldás:

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Statistics on problem C. 821. 608 students sent a solution. 5 points:437 students. 4 points:44 students. 3 points:23 students. 2 points:9 students. 0 point:50 students. Unfair, not evaluated:45 solutions.