MHB What is the geometric basis of the method of false position (Regula Falsi)?

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The method of false position, or Regula Falsi, is based on linear interpolation between two points on a function's curve. It utilizes the concept of a secant line to estimate the root of a function by creating a triangle that represents the area under the curve. This geometric approach allows for successive approximations by adjusting the interval based on the function's behavior. The method is effective for finding roots in cases where the function is continuous and changes sign. Understanding this geometric foundation enhances the application of the method in numerical analysis.
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On what geometrical construction is the method of false position (Regula Falsi) based?
 
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Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?

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