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Given regular pentagon ABCDE a circle can be drawn that is tangent to DE at D and to AB at A. What is the ratio of the radius to the circle to side AB?

 

 Oct 24, 2021
 #1
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Radius = 0.850650808 smiley

 Oct 25, 2021
 #2
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when the pentagon's side is 1laugh

Guest Oct 25, 2021

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