Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 133
es of thetriangle which measures the required angle between the planes;and the point 0 lies at the foot of a perpendicular through theapex. Compare Fig. 113. As soon as the length of this per-pendicular has bjBcn found, the triangle, and hence also the re-quired angle between the planes, will be… … Fia. 113 VI. §101] POINTS, LINES, AND PLANES 115 on cfib as an axis into H, the line oc will be seen in its truelength and drawn perpendicular to ab as shown by oc. - Returning to Fig. 114, draw o*o* perjtendieular to a*&* and make it equal to ao*. The triangle o*o*fe* is the true shape of the…
Geometry, Descriptive
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