Construction of the double elements of two ranges of points on the same circle.
1) Double Points On a Circle : [url]http://www.geogebratube.org/material/show/id/35593[/url]
[b]→2) Double Rays from a Point[/b]
3) Double Points on a Line: [url]http://www.geogebratube.org/material/show/id/35633[/url]
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This is problem #60 in Heinrich Dorrie's [i]100 Great Problems of Elementary Mathematics[/i].
