Higbee, F. G · New York, John Wiley & Sons · leaf 64
al cases it should be remembered that when a Hne Hes in a plane and is parallel toH or V, it will be parallel to the H or V trace of the plane. Seeobservations on planes, Article 23. 44. Proposition 4. Given the plan and elevation of a pointto pass through it a plane parallel to two lines whose… … Construction. Let the problem be to cut off the trough,Fig. 47, one of whose edges is NP, by a plane through P parallelto MN and NO. Through p draw pq and pr parallel to the planof the two given Hnes, nrn and no. Also draw pq and prparallel to mn and no. Find now where these lines, PQ andPR, which…
Geometry, Descriptive
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