Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives., a different problem: the task (which has been proven to be impossible) of constructing, for a given circle, a square of equal area with alone.However, in the plane, a decomposition into finitely many pieces must preserve the sum of the of the pieces, and therefore cannot change the total area of a set (). These results should be compared with the much more in three dimensions provided by the those decompositions can even change the of a set. Moreover, this stronger statement can be proved as well to be accomplished by means of translations only. It follows from a result of that it is possible to choose the pieces in such a way that they can be moved continuously while remaining disjoint to yield the square. The is a related but much simpler result: it states that one can accomplish such a decomposition of a simple polygon with finitely many polygonal pieces if both translations and rotations are allowed for the reassembly. Laczkovich actually proved the reassembly can be done using translations only rotations are not required.Īlong the way, he also proved that any simple in the plane can be decomposed into finitely many pieces and reassembled using translations only to form a square of equal area. The pieces used in Laczkovich's proof are. In particular, it is impossible to dissect a circle and make a square using pieces that could be cut with an pair of scissors (that is, having boundary). More recently, in 2017, Andrew Marks and Spencer Unger gave a completely constructive solution using. Laczkovich estimated the number of pieces in his decomposition at roughly 10 50. This was proven to be possible by in 1990 the decomposition makes heavy use of the and is therefore. Tarski's circle-squaring problem is the challenge, posed by in 1925, to take a in the plane, cut it into finitely many pieces, and reassemble the pieces so as to get a of equal.
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