552. [K1. 6. b.] On the Conic in Polar Co-ordinates

1920 Mathematical Gazette  
We propose to obtain, from geometrical considerations, certain results in polar co-ordinates, with the focus of the conic as pole. 1. The tangent at a given point. Taking any point R (Fig. 1 ) whose co-ordinates are r, 0, on the tangent If from any point R (r, 6) on the chord RL, RN be drawn parallel to SZ and the axis respectively, we have, as in the case of the tangent, SL/RN=SP/PM=e. Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.
doi:10.1017/s0025557200192459 fatcat:jtqihjpqoncmdaipfu5sr2qs2e