Higbee, F. G · New York, John Wiley & Sons · leaf 106
n toboth the surface and the plane S the area they enclose will be thesection cut from the pyramid by the cutting plane S. If the truesize of this area is desired it may be found by revolving ABCDinto H or V about the corresponding trace Ss or Ss. PLANE SURFACES 95 Discussion: Second Method. Find… … Fig. 76. Construction. In Fig. 77, 0 is the apex of a solid octagonalpyramid whose base is in a plane parallel to H. By Article 56find where each edge pierces the cutting plane S, as at X, Y, etc.Join these points in order and the area thus enclosed will be thesection cut from the surface by the…
Geometry, Descriptive
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