Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 59
3, 12), through g, on ef, 1 from/,draw /ii parallel to ab. 3. Through J (39, 6, 0), draw mn parallel to the line joining j (44,16, 14) and k (35, 7, 14). 4. Draw op parallel to ef and oq parallel to ab through o (23, 12, 9).Find the true size of the angle poq. [Note. Draw a third line intersecting… … Fig. 34 projections of the lines. Let the student prove this propositionby the use of Fig. 34. An exception to the preceding statement occurs when boththe lines are parallel to the plane on which the projection ismade. A method for determining the true angle between anytwo lines is given in § 94.…
Geometry, Descriptive
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