Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 103
EOMETRY [VI, § 76 auxiliary plane cutting both of the given planes may be used.In the figure, the plane Z cuts X in the line ah and it cuts Y inthe line erf (§ 75). These lines of intersection will, themselves,intersect (since they are in the same plane), giving one point,e, on the required line of… … Fig. 87 Note that by choosing the auxiliary plane parallel to V, we have,in effect, merely shifted V forward, temporarily, in order to fixpoints otherwise beyond our reach. The principle involved can best be understood by makinga sketch like Fig. 85. Fold this sketch as shown in Fig. 88.In this…
Geometry, Descriptive
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