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Connect the points with lines at AF and DG (in red). At Y, the intersection of DG and EF, create perpendicular lines from Y to AF at Z, and again from Y to ED at W. This produces a number of phi relationships, or golden sections: Flat Earth Facts, Scared Geometry, Mathematical Expression, Golden Number, College Algebra, Geometric Construction, Differential Equations, Math Formulas, Mathematicians
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Geometric constructions of Phi in Circles

Phi appears in a number of geometric constructions using circles. There are a number of geometric constructions using a circle which produce phi relationships, as described below. Among mathematicians, there’s a bit of a competition to see how few lines can be used to create a phi proportion, or golden section, in the construction, or […]