Elements of geometry for the use of schools (1854)
Ireland. Board of National Education · Dublin : A. Thom · leaf 39
D 1% \ E PART FIRST. XXXII. To return to the measure of ground, it willbe observed that whatever be the obstacleswhich may be met with, the preceding methodenables us without difficulty to transfer to anopen space, all the triangles into which theground to be measured may have been divided.… … First we should construct a triangle equalto A B C, which might be done without pene-trating into the area of the triangle, by mea-suring the two sides A B, B C, and the angleC B A contained by them. Having described this triangle we shouldhave the value of the angle B C A, and the 30 ELEMENTS OF…
Geometry
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