## An Elementary Treatise on Trilinear Co-ordinates: The Method of Reciprocal Polars, and the Theory of Projections |

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angle angular points appears asymptotes b₁ becomes called centre Chap chapter chord circle cloth co-ordinates coefficients coincide common condition conic considered constant Crown 8vo curve denoted described determine distance drawn Edition equal equation EXAMPLES expressed find the equation fixed point focus follows four points given point given straight lines gives harmonic Hence hyperbola identical imaginary internal line at infinity locus meet move obtain opposite sides pair parabola parallel passing pencil perpendicular point of intersection points of contact polar pole positive projection proposition prove range ratios reciprocal relation represented respect right angles satisfy second degree seen sides similar Similarly suppose tangents term theorem third three points tion touch triangle of reference uaČ values whence written

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