An elementary treatise on coordinate geometry of three dimensions (1912)
Bell, Robert J. T. (Robert John Tainsh), 1877-1963 · London : Macmillan and co., limited · leaf 318
ANh TORSION Whence we easily findvhere r° piper-pv) pj£ and & (It,1, Ex. 6. Prove that the radii of curvature and torsion of the Bpb f) fi^ -4- cr^ indicatrix of the binomials are -i- - and . ,- . Jpt + o-2 <r(<rp -<rp) Ex. 7. A curve is drawn on a right circular cone,… … Fig. 57. Take the vertex of the cone as origin and the axis as :-axis. Let C,fig. 57, be the projection of P, the point considered, on the axis, andCP and OP have measures r and R respectively. Then if CP makesan angle 6 with OX, r, 6 are the polar coordinates of the projection ofP on any plane at…
Geometry, Analytic
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