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 30
preaenlright circular cone whose eertea is the point (2, I, - :J), whoais parallel to OY and whose semhgertical angle is US . Ex. 7. Prove tliat aP+yL + i1 - 2x + 4y - 6z - 2 = 0 reptf.sphere whose centre is at (1, - 2, 3) and radius 4. 8. To find the coordinates of the point which <ii… … Fig. 4. Then, since three parallel planes divide any two straightlines proportionally, PR: PQ = PR: PQ=X:X+1. Therefore x — x. x2—x1 x+r Similarly, y and x = Xfto + ftiX + l Xfo+ffx „=Ml+-ix+i x+i These give the coordinates of R for all veal values o*( \.positive or negative. If X is positive, R…
Geometry, Analytic
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