Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 88
st lie within the angleA X X. Let the student work out this idea in its applicationto points in the second, third, and fourth quadrants. In certain special cases, one or both of the projections of apoint may lie on the traces of the plane. Let the student workout a few such cases. VI, § 60] POINTS,… … Fig. 71 points o and b, no particular relations appear to exist between thetraces of Y and the projections of ab. However, the tracesof the line, m and n, being special-case points, do have a definite
Geometry, Descriptive
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