Elements of geometry : containing books I to III (1886)
Smith, J. Hamblin · Toronto : W.J. Gage · leaf 108
m- parallels. If, then, from the pentagon we remove a BCD, and add BDF to the remainder, we obtain a quadrilateral ABFEeq livalent to the pentagon ABODE. Books I. & II.] AREA OF AX IRREGULAR POLYGON, ior The quadrilateral may then, by a similar process, be con-verted into an equivalent… … a f Let ABCDEFG be an irregular polygon. Draw AE, the longest diagonal, ami 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…
Geometry
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