Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 132
constructed (dc*e). This gives the required angle /8 between X and Y. This whole construction centers around the line oe, which is common to the triangles aalhand dee. The first operation(drawing the line ZZ) merelylocates a definite auxiUary plane,thus fixing the points d, c, and o.The second… … 116 DESCRIPTIVE GEOMETRY [VI, § 101 EXERCISE SHEET XLV Find the angle between each of the following pairs of planes. 1. Z (75, 2* 60° r, Z 45° r) and Y (55, Y^ 45° I, Y 45° I). 2. X (50, Z* 60° r, X 45° r) and TT (30, W 60° H, IF» 45° I). 3. t/ (25, [/*60°r, Vlhr) and F (5, 7*45°/, F« 75°«).…
Geometry, Descriptive
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