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Encyclopedia Britannica



QUADRILATERAL

This article appears in Volume V22, Page 707 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: PYR-RAY
QUADRILATERAL , in geometry, a figure enclosed by four straight lines. It is also a military
term
  applied to a combination of four fortresses mutually supporting one another. The fortresses of Namur, Liege, Maastricht, and
Louvain
 , and also those of
Silistria
 , Rustchuk, Shumla, and Varna, were so called. But the most famous quadrilateral was that of the four fortified towns of
north
  ItalyMantua, Peschiera, Verona, and
Legnago
 ,
A
the two former of which are situated on the Mincio and the two latter on the
Adige
 . The real value of the quadrilateral, which gave
Austria
  such a
firm
  hold on
Lombardy
 , lay in the
great
  natural strength of Mantua and in the readiness with which troops and supplies could be poured into Verona from the
north
 .


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