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 116
Fig. 210. Problem 133. To trisect a giveii triangle ABC froma given point D inside it. Trisect the line AC in E and F(Prob. 10). Join DE and DF. DrawBH parallel to DE (Prob. 4), and joinDH. Draw BL parallel to DF, andjoin DL. Join BD. Then the linesBD, DH, and DL will trisect the giventriangle ABC.… … 211. 96 PRACTICAL PLANE GEOMETRY CHAP. the given point E, draw EK, and produce it to H, Then the line EH will bisect the parallelo-gram ACDB. The triangle AEKis equal to the triangle DHK,and the triangle BHK is equalto the triangle CEK, Note. — A straight linedrawn from any point in anyof its…
Geometrical drawing
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