Elements of analytical geometry and the differential and integral calculus (1856)
Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Cincinnati : J. Ernst · leaf 84
rve. THE PARABOLA. 76 The expression for the area of the segment isfirysin.w. Corollary. When the diameter is theaxis of the parabola, then m=90°, andsin.7w=l, and the expression for the areabecomes fa:y. That is, every segment of aparabola at right angles with the axis is two-thirds its… … ■2px. (1) ■m.
Geometry, Analytic · Calculus
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