Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 131
ices of thetriangle which measures the required angle between the planes;and the point o lies at the foot of a perpendicular through theapex. Compare Fig. 113. As soon as the length of this per-pendicular has been found, the triangle, and hence also the re-quired angle between the planes, will be… … Fig. 113 VI, § 101] POINTS, LINES, AND PLANES 115 on ab as an axis into H, the line oe will be seen in its truelength and drawn perpendicular to ab as shown by oc. Returning to Fig. 114, draw aa perpendicular to a/U and make it equal to aa!. The triangle aal/of
Geometry, Descriptive
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