Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 134
tructed (<fc*e). This gives the required angle fi between X and Y. This whole construction centers around the line oc, which is common to the triangles aa^band dee. The first operation(drawing the line ZZ) merelylocates a definite auxiliary plane,thus fixing the points d, e, and o.The second… … Fio. 114
Geometry, Descriptive
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