Elements of geometry for the use of schools (1854)
Ireland. Board of National Education · Dublin : A. Thom · leaf 32
h weshould have to measure by drawing the per-pendiculars E F, C H, B G. Suppose, how-ever, that in the space ABODE, a rising 22 ELEMENTS OF GEOMETRY. ground, a wood, a pond, oppose our drawingthe lines required, how shall we get over thisdifficulty? The method which seems mostohvious is that of… … The threeaides of a XXVI.Let us begin by supposing that the obstacleis found within the triangle ABC, whosesides are known, and that we wish to describeanother triangle equal and similar on thechosen ground. In the first place we musttriangle be- draw the line D E equal to the side A B :, ;. ni„…
Geometry
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