## Yesterday's impossibilities |

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Alh'm ancient astronomers atomic scale Babylon ruins bee-line Brisbane British miles centre line Cheops circumference computing cosmic cube root decimal point diagonal diagram on figure diameter of circle divided doubled the cube east eclipse track electron Euclid Euclidean figure Euclidean geometry Fairfield centre fatal number finite pi-ratio Finite Square Root formula fraction give harbours of Carthage Hebrew hypotenuse Law geometry length mathematical mathematicians mile-age minus mounds multiplied north of equator Ordnance Survey perpendicular physicist pi-ratio series pi-ratio values pillars pin-point Plato precession produces proton proved puzzle Pyramid quadrant quantity attached radius ratio REHOBOAM roundest of arcs row of numbers Salt Tower simple Sir Thomas Smith Minor solar eclipse solution square units squares the circle Stonehenge straight line subtract tail tandem thirds and two-thirds Thomas Makdougall Brisbane Tower of London trisects the angle unit diameter circle unit sides west of Greenwich whole numbers