Plane trigonometry, and its application to mensuration and land surveying. Accompanied with all the necessary logarithmic and trigonometric tables (1852)
Perkins, George R. (George Roberts), 1812-1876 · New York, D. Appleton · leaf 12
hall take the succes-sive positions AC1? AC2, AC3,&c, then will the arc describedby the point C0 increase at thesame rate as the angle increases ;so that the arc CqQl is to the arcC0C2, as the angle C0 ACX is to the angle C0AC2; and the same for other arcs and their correspond-ing angles.… … 2 TRIGONOMETRY. [CHAP. I. cumference, the angle C0AC3 measured by this quadrant, iscalled a right angle. The right angle is usually taken as theunit angle; and all angles less than a right angle are calledacute angles, and are each measured by an arc less than one-fourth of an entire circumference.…
Plane trigonometry · Surveying
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