Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 108
een by reference to Fig. 93.The line ab is perpendicular to the plane Y. The H projectingplane Z is shown passing vertically downward through it. Thisplane Z is perpendicular to H and also to Y, since it containsab, which is perpendicular to Y. Since both H and Y are perpendicular to Z, the line of… … FiQ. 93 By the same reasoning it can be proved that Y 7 is perpen-dicular to ab. 80. Perpendicular Planes. Let the student visualize forhimself the truth of the following statements : (1) When two planes are perpendicular, their traces are not,in general, perpendicular. (2) The limiting conditions…
Geometry, Descriptive
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