540 degrees..........a zero and a 9............5 + 4 = 9......................5 * 4 = 20 ...........20 - 9 = 11................
www.cut-the-knot.org
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The Diagonal of a Regular Pentagon and the Golden Ratio. The ratio between the diagonal and the side of a regular pentagon is the golden ratio. ... We can think that the side of the regular pentagon is 1. And the diagonal is represented by , the Greek letter phi.
www.matematicasvisuales.com/english/html/.../goldenratio/pentagondiagonal.html
https://www.cut-the-knot.org/do_you_know/GoldenRatioInRegularPentagon.shtml
Golden Ratio in Regular Pentagon. The golden ratio, $\phi=\displaystyle\frac{1+\sqrt{5}}{2},$ makes frequent and often unexpected appearance in geometry.
www.matematicasvisuales.com/english/html/.../goldenratio/pentagondiagonal.html
The Diagonal of a Regular Pentagon and the Golden Ratio. The ratio between the diagonal and the side of a regular pentagon is the golden ratio. ... We can think that the side of the regular pentagon is 1. And the diagonal is represented by , the Greek letter phi.
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https://www.math.washington.edu/~king/coursedir/.../class/11-18-penta-answers.html
Total angle sum for pentagon = 3*180 = 540 degrees. So each vertex angle = 540/5 ... The Golden Ratio in the Regular Pentagon. Now we have many ways to ...
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