Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 152
es about this axis until they are perpendicularto V(oxH). The perpendicu-lar distance between the planeswill then appear. Construction (Fig. 208). LetQ and R be the given planes.Assume the axis A perpendicu-lar to H, and for conveniencelying in V. Revolve bothplanes about the axis A untilthey are… … 132 DESCRIPTIVE GEOMETRY [XIV, § 135 Corollary. To find the perpendicular distance from a pointto a plane. Analysis. Take an axis perpendicular to H (or V) throughthe given point. About this axis, revolve the plane until it isperpendicular to V (or H). Then, since the given point onthe axis does…
Geometry, Descriptive
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