A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 303
expression for m2, we have / ox\m* = $x ly+ —J —hxy; , _ a(2m*—xy) _ AK(fABC-AExED)wnence, x- lx_ay - KBxAE-AKxED The formula is general, whatever may be the ratio of the area m2 to thatof the triangle ABC. Let D B, instead of D E, bedivision. Divide | ABC byhalf of the perpendicular D H,let fall… … DIVIDING UP LAND. 289 latter (which will be C D G) by } D E, and the quotient willbe CG. Example. Let A B = 30 -00 ; B C = 45 -00 ; CA = 50 -00. Letthe perpendiculars from I) to the sides be these: DE = 10*00;DH = 20-00 ;DK = 5*17J. The content of the triangle ABCwill be 6666 square chains. Each of…
Surveying
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