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Anchor text: Platonic Solids
Anchor text: formula derivations
Anchor text: The Brachistochrone
Anchor text: P. Kunkel: Whistleralley site, ''The Planimeter''
Anchor text: Tangent Circles
Anchor text: Hanging With Galileo
Wikipedia: Wikipedia:Reference desk/Archives/Mathematics/2007 October 5
Anchor text: Tangent circles