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Four Golden Circles

Author:
John Golden
Topic:
Circle
Love this construction from Bùi Quang Tuån via Alexander Bogomolny at Cut-the-Knot. http://www.cut-the-knot.org/do_you_know/FourGoldenCircles.shtml Two tangent pairs of overlapping congruent circles. If the overlapping circles pass through each other's center, bam! Golden ratio all over the place.
More GeoGebra at bit.ly/mh-ggb

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