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Analysis of a very difficult, but interesting (olympiad) problem in stereometry. Many centers of the spheres described near the pyramids are considered.
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Here, perhaps the most difficult task on KZbin in terms of stereometry is sorted out! You can find it the eighth in a row in the version of the Lomonosov Olympiad in 2006. Here is an interesting statement of the condition, but if you figure it out, then there will be no problems with the solution - try to overcome the problem yourself, then the analysis will be clear and useful. Feel free to write your comments and suggestions in the comments, throw the terms of good and useful tasks! Well, if you are interested in mathematics - subscribe to the channel, you will not regret it!
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CONDITION
In the triangular pyramid SABC, the edge SA is perpendicular to the plane ABC, ∠SCB = 90 °, BC = √5, AC = √7. The sequence of On points is constructed as follows: the point O1 is the center of the sphere described near the pyramid SABC, and for each positive integer n≥2, the point On is the center of the sphere described near the pyramid O (n-1) ABC. How long must the edge SA have for the set {On} to consist of exactly two different points?