Scribner's engineers' and mechanics' companion : comprising United States' weights and measures : mensuration of superficies and solids ... the mechanical powers ... steam and the steam engine (1848)
Scribner, J. M · New York : Huntington and Savage · leaf 47
a Circular Zone. Rule.—From the area of the whole circle, subtract the areas ofthe two segments on the sides of the zone. ^ If from the whole circle there be takenthe two segments, a b c and d f g, therewill remain the circular zone, a bfd. Example.—1. What is the area of thezone, a b f d, it a b… … PROBLEM X. To find the Area of a Ring included between the Circumferences of two Concen-tric Circles. Rule-—1. Square the diameter of each circle, and subtract thesquare of the less from that of the greater. 2. Multiply the difference of the squares by the decimal 7854,and the product will be the…
Mechanical engineering · Weights and measures
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