Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 113
between twoplanes is the angle cut from the planes by another plane passedperpendicular to their hne of intersection. In Fig. 97, the planeZ is perpendicular to mn. According to the preceding definition,the angle hoc is the angle between the planes E and Y. Any plane, as Z, cuts from two… … Fig. 97 these planes by a third plane perpendicular to H. For in-stance, the plane X cuts out a smaller angle. 89. The Angle between a Line and a Plane. The anglebetween a line and a plane is the angle between the line and itsprojection on that plane. In Fig. 97, the angle dej is the anglebetween…
Geometry, Descriptive
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