A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 129
ts. Hence, AFG and AEC, having two angles and the includedside of one equal to two angles and the included side of the other, are equalin all respects; therefore AG = AC. Finally, ABC and ABG have two sidesand their included angles respectively equal, whence B is a right angle. 219. Second Method.—… … A E For the perpendiculars to the three sides of a triangle from the oppositeangles intersect in the same point. (c.) If the line be inaccessible. 220. From the given pointC towards two visible points Aand B (Fig. 88) of the givenline range out CA and CB,and by one of the precedingmethods draw the…
Surveying
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