Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 122
Case III); planes X and Rintersect in the line X; the lines M and N intersect in thepoint c, which is a point in the intersection of the planes Qand R (§ 117). The points t and c determine the required lineof intersection A. In Fig. 172, neither pair of traces intersect within the limitsof the… … Fig. 172. Fig. 17:5. Special Case V. Both planes intersect the ground line atthe same point (Tig. 173). Let Q and R be the given planes.The general r-ase fails because the points sand t are coincident.A point, c, in the required line of intersection, A, may bedetermined by means of the auxiliary…
Geometry, Descriptive
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