Geodaesia : or, The art of surveying and measuring land made easy (1768)
Love, John, fl. 1688, Clark, Samuel · London : Printed for J. Rivington · leaf 187
two being known, the third may befound by fubtrafting the two known angles out of180 degrees, the remainder is the third angle. To underftand well what the quantity of an angleis, take this following iliuftration. Let A BCD be a circle, whofe circumference isdivided (as all circles are fuppofed to… … fourth part of this circle, viz. 90 degrees fuch is thetriangle PEG. An angle cut off being lefs than 90 degrees, is a-cute as the angle H E F. The angle G EI is obtufe becaufe the two linesthat proceed from E, take in betwixt them morethan a quarter of the circle. A
Surveying
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