[Redbook9:33][19910402:1300c]{Computerisation of C[ircles] A[nalysis &] S[ynthesis]? (3) [continued]}[2nd April 1991]
19910402.1300
[continued]
(&* NB: ‘In certain cases, polar coordinates (q.v.) provide a more appropriate graphic system, whereby a series of concentric circles, with straight lines through their common centre, or origin, serves to locate points on a circular plane. Both Cartesian and polar coordinates may be expanded to represent three dimensions by introducing a third variable into the respective algebraic or trigonometric functions. The inclusion of three axis results in an isometric graph for solid bodies in the former case and a graph with spherical coordinates in the latter.’)
**
*[See last previous ts entry]
** – E[ncyclopaedia] B[ritannica] 5:429 ‘Graph’
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