The complete measurer; or, The whole art of measuring .. (1789)
Hawney, William · London : Rivington · leaf 108
ne to the other. TheCircle contains more Space than any plain Figure ofequal Compafs, Problem I. Having the Diameter and Circumfe-rence, to find the Area. The RULE, Every Circle is equal to a Parallelogram, whofeLength is equal to half the Circumference, and theBreadth equal to half the Diameter j… … 401.15 Thus, if the Diameter of a Circle (that is, theLine drawn crofs the Circle through the Center) be22.6; and if the Circumference be 71, the Half of71 is 35.5, and the Half of 22.6 is i [.3 ; whichmultiplied together, the Produ(5l is 401.15, which isthe Area of the Circle. Demonjiraiioji.…
Measurement · Geometry
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