Godfrey, C. (Charles), 1873-1924, Siddons, A. W. (Arthur Warry) joint author · Cambridge, University Press · leaf 135
fig. 66. AB is the segment a, CD is its projection.In the plane AEC draw BF || to DC, meeting AC in F.Then LABf = LAEC = 0,.. DC = BF = aco8^, 8—2 116 ORTHOGONAL PROJECTION 5. Lines parallel to the plane of projection are un-altered in length by projection. 6. If A be an area in a plane, its… … fig. 67. Let the area be divided up into strips ABCD by lines ofsteepest slope. By drawing parallels to the plane of projection, cut off arectangle AECF from each strip. Let AECF be the projection of AECF. Now A F = AF cos e, A E = AE. .. reot. AECF = rect. AECF x cos A If the strips become very…
Geometry, Modern
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