An elementary treatise on analytical geometry : embracing plane co-ordinate geometry, and an introduction to geometry of three dimensions (1869)
Johnson, William Woolsey, 1841-1927 · Philadelphia : J.B. Lippincott · leaf 99
re Px is the point (0, 3),and the equation of the circle is x2 -j- y2 — 4x -f- 6y — 7 = 0, sub-stitution of x = 0, y = 3 in the first member gives 20. This ofcourse shows that the point is not on the circle; but we now seethat it also shows that the point is at such a distance that the tan-gent is…
Geometry, Analytic
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