Elements of geometry : containing books I to VI and portions of books XI and XII of Euclid, with exercises and notes (1881)
Smith, J. Hamblin (James Hamblin), 1829-1901, Kirkland, Thomas, 1835-1898 · Toronto : W.J. Gage · leaf 108
els. If, then, from the pentagon we remove lBOD, and addA BDF to the remainder, we obtain a quadrilateral ABFEequivalent to the pentagon A BOOFj, Books I. & n.] AREA OF AN IRREGULAR POLYGON. loi The quadrilateral may then, by a similar process, be con-verted into an equivalent triangle, and… … Let ABCDEFG be an irregular polygon. Draw AE, the longest diagonal, and drop pei-pendicularson AE from the other angular points of the polygon. The polygon is thus divided into figures which are eitherright-angled triangles, rectangles, or trapeziums ; and the areasof each of these figures may be…
Geometry · Geometry, Plane
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