Barrow, Isaac, 1630-1677, Child, J. M. (James Mark), tr · Chicago, London : The Open court publishing company · leaf 66
the non-parallel sidesboth pass, if produced, through the vertex. Tacquetuses the surface generated by the top parallel sides,PS as if he were finding the area of a circle, bymeans of concentric rings (? or he uses the perpendi-cular distance from S on QR) ; Barrow points out thathe should use the… … 46 BARROWS GEOMETRICAL LECTURES plane surfaces are triangles and the area of the curvedsurface is thus easily found. There are other methods which may be used convenientlyin certain cases; but enough has been said for the presentconcerning the construction of magnitudes by simplemotions. Note It…
Geometry
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