They occur in all parts of the world, and differ according to diversity of climate, region, kind of water, aamp;c. ... figure having more than four sides or four angles; but, in treating of polygons generally, geometers also include the triangle and the quadrangle. ... are equal to one another, and the bther half also equal to one another, but different from the former, and the equal and unequal sides are placed alternately. ... This formula also gives the area of the polygons of the second class (fig.
|Title||:||A Dictionary of Science, Literature, and Art|
|Author||:||William Thomas Brande|