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C. 821. A unit square ABCD is rotated about its vertex C through 90o. 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.

• Problems in Mathematics of KöMaL, October 2005

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