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Radius, Lambeth: chariot wheel

Radius

“Radius” burglar alarm, Lambeth • In classical geometry, the radius of a circle or sphere is the length of a line segment from its center to its perimeter. The name comes from the Latin radius, meaning ‘ray’, but also the spoke of a chariot wheel. And it’s also one of the two sub-elbow arm bones, so called because it rotates around the other one, the ulna. Thanks, Wikipedia! • Spotted: Sail Street, Lambeth, London, SE11, England, 2011 • Politics: In the Labour constituency of Vauxhall

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