Elements of geometry, containing books I and II with exercises and notes (1882)
Smith, J. Hamblin (James Hamblin), 1829-1901 · Toronto : Gage · leaf 108
llels. If, then, from the pentagon we remove a BOD, and addA BDF to the remainder, we obtain a quadrilateral ABFEequivalent to the pentagon A BODE. Books I. k II.] AA:£A OF AX 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 perpendicularson 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
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