Woods, Frederick S. (Frederick Shenstone), 1864-, Bailey, Frederick H. (Frederick Harold), 1865- · Boston, New York [etc.] Ginn and Company · leaf 328
e projections onany straight line of abroken line and the straight line joining its ends are the same. We will now show that the projection of a)iy plane area )i/»>nanother plane is the product of that area and the cosine of theangle between the planes. Let XOY (fig. 197) be any plane through OY… … 312 SPACE GEOMETRY Then (§ 125) area AB = C(x[ - x[) dy, (1) the limits of integration being taken so as to include thewhole area. In like manner, areaAB — I (x2 — xi)dy, (2) the limits of integration being taken so as to cover the whole area.But the values of y are the same in both planes, since…
Geometry, Analytic · Calculus
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