Elements of analytical geometry and the differential and integral calculus (1856)
Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Cincinnati : J. Ernst · leaf 57
ea ellipse.But the area of the circle on the major axis, is rtA^.Substituting this, and the proportion becomesA : B=irtA^ : area ellipse. Or area ellipse=rt^^, which is the mean proportional between {jtA^) and (ttB^,) theexpressions for the areas of the circles, one on the major axis,the other on… … ScHDUUM. Hence the common rule in mensuration to findthe area of an ellipse. Rule—Multiply the semi-major and semi-minor axes togethert aridmultiply that product iy 3.1416. PROPOSITIOlf V. To find the product of the tangents of two supplementary chordswith the axis of X. Let X, y, be the…
Geometry, Analytic · Calculus
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