Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 122
triangle required. As any rectilinear figure draAvn on DB must equal the sum-areas of similar figures drawn on AB and AD, and as AD is equal to AB, the figure drawn on DB must be twice the area of the figure drawn on AB. The line EB is equal to the line DB, so the triangle EFB must be twice the… … I02 PRACTICAL PLANE GEOMETRY chap. equal any number of times a given quadrilateral, polygon, orcircle. It has been shown (Prob. 116) that CD in Fig. 222 isthe mean 2^>oportional between the lines AD and DB; bymeans of the right-angled triangle ABC we can extend theanalogy. The three triangles…
Geometrical drawing
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