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
isect the side AC in the points E and F (Prob. 10), JoinDB. From E draw the line EH parallel to DB (Prob. 4). JoinDH. Draw the line FL parallelto EH, and join DL. Then thelines DH and DL trisect the giventriangle ABC. It will be noticed that the con-struction of this problem is on thesame principle… … 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.…
Geometrical drawing
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