Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 100
lanes. Two such pointsare necessary to fully determine the line of intersection of anytwo planes. VI, § 76] POINTS, LINES, AND PLANES 83 In Fig. 82 are shown two planes, X and Y. All points onX X lie in X. All points on Y F lie in Y. Therefore thepoint a, which lies in both the hnes, is in both the… … This point lies in V, and hence o* lies on HA. In the sameway 6 and b are found by using the H traces of the given planes.Hence the lines a^t* and a^b^ are the projections of the Une ofintersection of the planes X and Y. [Note. The relation between such a Une as ah, above, and itsprojections seems…
Geometry, Descriptive
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