His lasting achievement is found in his book Geometria rotundi (1583), where he introduced the trigonometric functions tangent and secant.
... Zone 3)
Poplar[?] (DLR; Zone 2)
Preston Road[?] (Metropolitan Line; Zone 4)
Prince Regent[?] (DLR (Beckton Branch); Zone 3)
Pudding Mill Lane[?] (DLR (Stratford ...
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