Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 86
) by any two intersecting orparallel lines. Figure 63 a shows a part of a plane, X, and threepoints, o, b, and c, lying in X. The projections of these pointsmight be said to determine the plane, X. No other planecould be determined by these projections, but any other three 66 VI, § 56] POINTS,… … Fio. G3 scription of the plane, since the choice of these points is notunique. In the same way, it can be shown that the projectionsof intersecting or parallel lines, lying in X, would not constitutea unique description.However, if the planeis considered as of in-definite extent, it willintersect…
Geometry, Descriptive
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