Elements of analytical geometry and the differential and integral calculus (1856)
Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Cincinnati : J. Ernst · leaf 44
t FT bymeans of the similar triangles ABP, PBT, which giveX \ R \ \ y \ FT. ft=rI. X More general and elegant formulas will be found in the cal-culus for the normals, subnormals^ tangents, and suhtangentsapplicable to all the conic sections. Note to Propositions III and IV of this Chapter.—In the… … THE CIRCLE. 35 In these propositions it is not assumed that the radius of the circle is atright angles to its tangent when drawn from the center to the point of con-tact, but we see no propriety in excluding this geometrical truth so wellknown in elementary geometry, especially when we consider…
Geometry, Analytic · Calculus
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