Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 102
nes. Two such pointsare necessary to fully determine the line of intersection of .anytwo planes. YI, § 76] POINTS, LINES, AND PLANES 83 In Fig. 82 are shown two planes, X and Y. AU points onXX lie in A. All points on Y Y lie in Y. Therefore thepoint a, which- lies in both the lines, is in both the… … This point lies in V, and hence a lies on HA. In the sameway 6 and 6* are found by using tlie // traces of the given planes.Hence the lines a^fe* and afc are the projections of the line ofintersection of the planes X- and Y. [Note. The relation between such a line ap ah, above, and itsprojections…
Geometry, Descriptive
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