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It was noted that four-legged chairs usually present imbalance, while three-legged ones do not. Mathematics explains this fact, but it is difficult to understand. To understand why, look at a farm gate. It has a diagonal board, forming two triangles. In this way, it is more resistant to deformation and the maintenance of its balance is guaranteed. Likewise, the three legs of a chair form a triangle, making it more robust and stable.
