C. 821. A unit square ABCD is rotated about its vertex C through 90o. Determine the area swept out by the side AB.
Deadline expired on 15 November 2005.
Google Translation (Sorry, the solution is published in Hungarian only.)
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.